Acoustic Geography, Nāda-Brahma and the East–West Phonetic Gradient: Reinterpreting Grāma Theory, Musical Aesthetics and Cultural Soundscapes in Eastern India

Abstract

The relationship between language, sound, environment, and musical expression has long occupied a central position within Indian musicological thought. Classical Indian theories of Nāda-Brahma, Grāma, Jāti, Bhāva, and Rasa recognize sound not merely as an acoustic phenomenon but as a manifestation of consciousness and cultural experience. This study investigates the hypothesis that an observable East–West phonetic gradient across the Indian subcontinent corresponds to broader differences in musical aesthetics, vocal production, and cultural soundscapes. Drawing upon concepts preserved in classical Sanskrit treatises, especially the traditions associated with Grāma theory, the paper examines how phonetic softness, nasal resonance, melodic fluidity, and ecological sound imitation are particularly prominent in the musical traditions of Eastern India. 

The study focuses on Assam and the Eastern Himalayan cultural region, where traditions such as Bihu, Jāgar, Mālacī Gīt, Bhāṭiyālī, and related folk and ritual genres exhibit distinctive characteristics of high-register singing, gliding melodic movement, nature-oriented sonic symbolism, and the expansion of silence as an aesthetic element. Using an interdisciplinary methodology combining textual analysis, ethno-musicology, acoustic interpretation, cultural geography, and intangible cultural heritage studies, the paper proposes that these features may be interpreted through the conceptual lens of Madhyama Grāma and the philosophy of Nāda-Brahma.  

The paper further argues that the cultural soundscape of Eastern India reflects a broader metaphysical orientation toward Śūnya (creative emptiness), resonance, ecological harmony, and Lāsya aesthetics. Rather than presenting the East–West distinction as a rigid historical reality, the study offers it as a heuristic framework for understanding the interaction between language, music, environment, and cultural memory. Such an approach contributes to contemporary discussions in ethnomusicology, sound studies, heritage preservation, and the philosophy of music.

 

Keywords

Nāda-Brahma; Grāma Theory; Madhyama Grāma; Acoustic Geography; Assam; Bihu; Jāgar; Śūnya; Ethnomusicology; Cultural Soundscape; Intangible Cultural Heritage; Eastern India; Lāsya; Musical Ecology; Indian Musicology

 

 

 

1. Introduction

Sound occupies a unique position within Indian civilization. Unlike many philosophical systems that treat sound primarily as a physical phenomenon, Indian thought understands sound as a bridge between consciousness and creation. The doctrine of Nāda-Brahma proposes that the universe itself originates from vibration, and that music represents one of the most refined manifestations of cosmic order.

Within classical Indian musicology, discussions of Grāma, Jāti, Śruti, Bhāva, and Rasa reveal a sophisticated understanding of the relationship between sound, emotion, environment, and human experience. These concepts suggest that musical expression emerges not only from technical structures but also from broader cultural and ecological contexts.

The present study explores a hypothesis preserved in regional observations and supported by certain interpretative readings of Indian musicological theory: namely, that movement from western to eastern regions of the Indian subcontinent corresponds to a gradual softening of phonetic articulation and a parallel transformation in musical aesthetics. The observation proposes that eastern linguistic cultures tend to favor nasal resonance, liquid consonants, softer articulation, and melodic fluidity, while western regions often exhibit stronger plosive articulation, sharper tonal boundaries, and more angular musical expression.

Although such distinctions should not be treated as rigid historical facts, they offer a useful framework for examining the relationship between language and music. The musical traditions of Assam and Eastern India provide particularly rich examples. Bihu songs, Jāgar traditions, Bhāṭiyālī melodies, ritual chants, and nature-oriented folk genres frequently emphasize gliding pitch movement, high-register vocalization, flexible intonation, and close interaction with ecological soundscapes. 

It proposes that these characteristics may be understood through the conceptual distinction between Ṣaḍja Grāma and Madhyama Grāma. According to this interpretation, the aesthetic tendency toward softness, resonance, silence, and melodic continuity corresponds more closely with the symbolic logic of Madhyama Grāma, while stronger attack, clearer tonal segmentation, and greater emphasis on struck articulation may reflect tendencies associated with Ṣaḍja Grāma. It further associates these tendencies with broader philosophical categories such as Śūnya, Lāsya, Anunāda, and ecological mimicry. 

This paper does not seek to establish a definitive historical division between eastern and western musical cultures. Rather, it investigates how classical musicological concepts may provide an interpretative framework for understanding regional variations in sound production, musical aesthetics, and cultural perception.

 

2. Research Objectives

The study seeks to:

1. Examine the relationship between phonetic articulation and musical timbre within Indian cultural traditions.
2. Investigate the relevance of Grāma theory for interpreting regional musical aesthetics.
3. Explore the connection between Nāda-Brahma philosophy and acoustic geography.
4. Analyze the musical traditions of Assam and Eastern India as examples of ecological sound consciousness.
5. Evaluate the role of Śūnya, resonance, and silence within Eastern Indian musical expression.
6. Contribute to contemporary discussions on intangible cultural heritage and sound-based cultural identity. 

 

3. Research Questions

The study is guided by the following questions: 

1. Can phonetic characteristics influence regional musical aesthetics?
2. How may Grāma theory be reinterpreted within contemporary ethno-musicological discourse?
3. What role do ecology and environmental soundscapes play in shaping musical expression?
4. How do concepts such as Śūnya, Nāda-Brahma, and Lāsya contribute to Eastern Indian musical traditions?
5. Can sound heritage be understood as an important component of intangible cultural heritage preservation? 

 

4. Methodology

This research adopts an interdisciplinary methodology combining textual scholarship, ethno-musicology, acoustic interpretation, and heritage studies.

 

4.1 Textual Analysis

Primary attention is given to classical Indian musicological concepts found in traditional Sanskrit sources, including discussions of Nāda, Grāma, Jāti, Bhāva, and Rasa. The objective is not to reconstruct historical musical systems precisely but to examine their interpretative potential for contemporary sound studies.

 

4.2 Ethno-musicological Interpretation

Selected musical traditions from Assam and Eastern India are examined as living examples of regional sound cultures. Particular attention is given to:

 

·         Bihu

·         Jāgar

·         Mālacī Gīt

·         Bhāṭiyālī

·         Ritual and folk performance traditions

 

These traditions are analyzed with reference to vocal style, melodic movement, timbre, rhythm, and performance context.

 

4.3 Acoustic Interpretation

The study employs basic principles of acoustics to explore the relationship between:

 

·         Vocal resonance

·         Nasality

·         Harmonic structure

·         Attack and decay characteristics

·         Timbre production

 

The analysis follows the manuscript’s proposition that softer phonetic articulation often corresponds to greater resonance and reduced attack energy.

 

4.4 Cultural Geography

The concept of acoustic geography is used to examine how rivers, climate, agricultural systems, ecological environments, and patterns of settlement may influence cultural sound production and perception.

 

4.5 Heritage-Based Approach

The study incorporates contemporary approaches to intangible cultural heritage by examining sound traditions as repositories of collective memory, ecological knowledge, ritual practice, and community identity.

 

4.6 Interpretative Framework

The principal interpretative framework combines:

 

·         Nāda-Brahma

·         Śūnya philosophy

·         Grāma theory

·         Acoustic ecology

·         Cultural soundscape studies

 

This framework allows the study to investigate how musical systems function simultaneously as artistic expressions, ecological adaptations, and carriers of cultural memory.

 

 

5. Literature Review

The relationship between sound, consciousness, and environment has occupied an important position within Indian intellectual traditions for more than two millennia. Classical musicological texts do not treat music as an isolated art form but as an integrated expression of cosmology, psychology, ritual, and social life.

The earliest systematic discussions of music appear in Bharata’s Nāṭyaśāstra, where concepts such as Nāda, Śruti, Grāma, Jāti, Bhāva, and Rasa are presented as interconnected elements of aesthetic experience. Bharata regarded music as an extension of human emotion and cosmic order, capable of transforming both performer and listener through the medium of sound. 

Mataṅga’s Bṛhaddeśī introduced a more explicit recognition of regional musical forms (deśī traditions), acknowledging that geography and culture influence musical expression. This recognition is particularly important for the present study because it allows regional sound cultures to be understood within a broader musicological framework. 

Śārṅgadeva’s Saṅgīta Ratnākara and Śubhaṃkara’s Saṅgīta Dāmodara further refined discussions concerning Nāda, Grāma, voice production, tonal organization, and aesthetic experience. The text recognizes distinctions in vocal timbre, articulation, and musical temperament that may be interpreted as early observations regarding the diversity of sound cultures across different regions of India. The manuscript under examination draws heavily upon these concepts in proposing a relationship between phonetic softness and musical aesthetics. 

Modern scholarship has expanded these perspectives through the fields of ethnomusicology, acoustic ecology, cultural geography, and sound studies. Scholars have increasingly recognized that musical systems emerge from interactions among environment, language, social organization, ritual practice, and historical memory.

Recent heritage studies have also emphasized that sound itself constitutes an important dimension of intangible cultural heritage. Traditional songs, ritual chants, instrumental practices, and oral performance systems preserve cultural knowledge that often cannot be adequately understood through textual records alone. 

The present study contributes to this growing body of scholarship by proposing an interdisciplinary interpretation of the relationship between language, ecology, sound, and musical aesthetics in Eastern India.

 

6. Nāda-Brahma and the Philosophy of Sound

The philosophical foundation of Indian music rests upon the doctrine of Nāda-Brahma, the principle that ultimate reality manifests as sound or vibration.  

According to this doctrine, creation itself originates from vibration. Sound is therefore not merely an audible phenomenon but a bridge between consciousness and manifestation. Traditional philosophical literature frequently describes the evolution of sound through four progressive stages: 

1.       Parā

2.       Paśyantī

3.       Madhyamā

4.       Vaikharī

 

Parā represents un-manifest sound existing in its most subtle form. It is pure potentiality, beyond articulation and beyond sensory perception. 

Paśyantī represents the stage where sound begins to emerge as intention or vision. It remains inaudible but possesses direction and purpose. 

Madhyamā represents internal sound, mental vibration, and subtle resonance. At this stage, sound exists as thought, imagination, and inner experience. 

Vaikharī represents articulated sound expressed through speech, song, and instrumental performance. 

This fourfold model is particularly significant for understanding the manuscript's distinction between “hard” and “soft” sound cultures. It suggests that eastern musical traditions place greater emphasis upon resonance, continuity, and internal vibration, whereas more forceful sound production emphasizes attack and articulation. In symbolic terms, this distinction may be interpreted as a greater orientation toward Madhyamā Nāda rather than exclusive dependence upon Vaikharī Nāda. 

Within this framework, silence is not the absence of sound. Silence represents the field from which sound emerges and to which it returns. This understanding directly connects Nāda-Brahma with the philosophical concept of Śūnya. 

 

7. Śūnya, Resonance and Musical Consciousness

The Sanskrit term Śūnya is often translated as “emptiness,” but within Indian philosophical traditions it signifies potentiality rather than absence. 

In Buddhist, Yogic, and Tantric thought, Śūnya represents a state of limitless possibility. It is the fertile space from which creation emerges and into which all forms ultimately dissolve. 

Musically, Śūnya may be understood as the silence between sounds. 

Every musical phrase begins in silence and returns to silence. Without silence, rhythm cannot exist; without silence, melody loses contour; without silence, emotional contrast becomes impossible. 

It repeatedly emphasizes this relationship between sound and emptiness through the concept of “Śūnyatā → Punarutpatti,” or the regeneration of sound from silence. According to this interpretation, Eastern Indian musical traditions exhibit a distinctive tendency to expand the role of silence within performance. Long melodic glides, sustained tones, gradual transitions, and spacious rhythmic structures allow silence to function as an active aesthetic element rather than merely an absence of sound. 

This concept is particularly visible in: 

·         Bihu melodies

·         Bhāṭiyālī songs

·         Jāgar traditions

·         Devotional folk genres

·         Riverine musical cultures

 

The aesthetic importance of silence may therefore be understood as an extension of the broader philosophical principle of Śūnya. 

 

8. Grāma Theory and Acoustic Space

Among the most sophisticated achievements of Indian musicology is the theory of Grāma. 

Traditionally, three Grāmas are described: 

·         Ṣaḍja Grāma

·         Madhyama Grāma

·         Gāndhāra Grāma 

Of these, only the first two remain significant within later theoretical discourse. 

Grāma may be understood as a tonal framework, intervallic structure, and aesthetic orientation. It is not merely a scale but a complete sonic environment that influences musical behavior, perception, and emotional expression. 

It proposes an interpretative distinction between Ṣaḍja Grāma and Madhyama Grāma as symbolic representations of contrasting musical tendencies.

 

Ṣaḍja Grāma: S-R-G-M-P-D-N-S

 

Associated characteristics include:

 

·         Strong tonal grounding

·         Greater emphasis on attack

·         Distinct note separation

·         Angular melodic motion

·         Clear articulation

 

Madhyama Grāma: M-P-D-N-S-R-G-M

 

Associated characteristics include:

 

·         Melodic fluidity

·         Greater resonance

·         Expanded use of glides

·         Softer articulation

·         Increased aesthetic emphasis on continuity

 

The present study does not argue that contemporary regional traditions directly preserve ancient Grāma systems. Rather, Grāma theory is employed as a conceptual model for understanding differences in musical character and aesthetic orientation.

 

9. Acoustic Geography and the East–West Phonetic Gradient

One of the most original propositions of it is the idea of an East–West phonetic gradient across the Indian subcontinent. 

According to this hypothesis, movement eastward corresponds to increasing prominence of:

 

·         Nasal resonance

·         Liquid consonants

·         Softer articulation

·         Melodic intonation

·         Vocal fluidity 

Conversely, movement westward tends toward:

 

·         Stronger plosive articulation

·         Sharper consonantal attack

·         Greater tonal segmentation

·         Increased emphasis on vocal projection 

While such observations should not be interpreted as universal rules, they provide a useful framework for examining relationships between language and music. 

Speech and singing utilize the same vocal apparatus. Consequently, habitual phonetic patterns inevitably influence vocal production. 

It interprets this phenomenon through the distinction between Komala Varṇa and Paruṣa Varṇa. Softer phonetic articulation corresponds to greater resonance and continuity, while stronger articulation emphasizes attack and separation. 

From an acoustic perspective, this distinction may be understood as the balance between:

 

·         Resonance and attack

·         Continuity and segmentation

·         Flow and impact

 

These characteristics are reflected not only in speech but also in melodic style, rhythmic organization, instrumental design, and performance practice. 

 

10. Lāsya Aesthetics and Eastern Musical Expression

It associates Eastern Indian musical traditions with the concept of Lāsya. 

In Indian aesthetic theory, Lāsya represents grace, fluidity, delicacy, and expressive movement. Traditionally associated with feminine energy, it emphasizes continuity rather than force. 

Musically, Lāsya manifests through:

 

·         Curvilinear melodic movement

·         Gentle ornamentation

·         High-register singing

·         Flexible rhythm

·         Emotional intimacy 

Many Eastern Indian traditions display these characteristics. 

·      Bihu songs frequently employ soaring melodic contours and flexible pitch movement.

·         Bhāṭiyālī songs imitate the flowing movement of rivers.

·         Jāgar traditions combine narrative recitation with ritual resonance.

 

In each case, musical expression emerges through gradual transformation rather than abrupt contrast. 

The manuscript therefore proposes that Lāsya may be understood as a sonic manifestation of resonance, continuity, and ecological harmony. 

This interpretation provides a valuable framework for understanding the relationship between musical aesthetics and cultural identity in Eastern India.

 

11. Bihu, Jāgar and the Kāmarūpī Musical Logic

Among the living musical traditions of Eastern India, the musical culture of Assam provides one of the most compelling examples of the interaction between ecology, language, ritual, and sound. The traditions of Bihu, Jāgar, Mālacī Gīt, Ojāpāli, Deodhani performance, and other ritual-musical systems collectively preserve a distinctive acoustic identity that differs significantly from many other musical traditions of the Indian subcontinent. 

It under consideration proposes that Assamese musical culture exhibits characteristics closely associated with melodic continuity, resonance, high-register vocalization, and emotional fluidity. These qualities may be interpreted as manifestations of a broader "Madhyama-oriented" musical consciousness.

 

11.1 Bihu as an Ecological Sound System

Bihu is frequently described as a folk festival; however, from a musicological perspective, it represents a highly sophisticated ecological sound system. 

The principal instruments of Bihu include:

 

·         Dhol

·         Pepa

·         Gogona

·         Xutulī

·         Taal

 

These instruments collectively reproduce aspects of the natural environment.

 

·         The Pepa imitates the long, penetrating calls associated with open landscapes and pastoral environments.

·         The Xutulī recreates bird calls and atmospheric sounds.

·         The Dhol generates thunder-like rhythmic energy associated with seasonal transformation.

·         The Gogona produces continuous buzzing resonance resembling natural harmonic vibrations.

 

Thus, Bihu music may be understood not simply as entertainment but as a sonic representation of ecological renewal. 

 

11.2 Jāgar and Ritual Resonance

Jāgar traditions occupy a unique position within the ritual culture of old Kāmarūpa but now in Vyaspara village of Mangaldoi District. 

Unlike many folk traditions that focus primarily on social celebration, Jāgar functions as an invocation of sacred presence. 

The objective is not merely musical performance but ritual awakening. 

Within Jāgar performance:

 

·         sound emerges from silence,

·         invocation emerges from concentration,

·         resonance emerges from ritual intention.

 

This process reflects the philosophical movement:

 

Śūnya → Nāda → Anunāda → Darśana

(Emptiness → Sound → Resonance → Revelation)

 

The ritual musician therefore acts not merely as a performer but as a mediator between visible and invisible realities.

 

11.3 The Sonic Role of Repetition

One of the distinctive characteristics of Jāgar and related traditions is the extensive use of repetition. 

Repeated phrases create:

 

·         trance-like concentration,

·         acoustic immersion,

·         collective participation,

·         ritual continuity.

 

From a sound studies perspective, repetition functions as a mechanism for transforming ordinary hearing into heightened listening. 

The resulting sonic environment generates a field of resonance that extends beyond linguistic meaning. 

 

12. Nature Mimicry and Instrumental Acoustics

A notable feature of many Eastern Indian musical traditions is their tendency to imitate natural sounds. This phenomenon may be described as ecological acoustics. 

It repeatedly emphasizes that traditional instruments were not designed arbitrarily but evolved through prolonged interaction with environmental soundscapes.

 

12.1 Thunder and the Dhol

The Bihu Dhol produces deep rhythmic patterns that resemble:

 

·         thunder,

·         approaching storms,

·         atmospheric turbulence.

 

In agrarian societies dependent upon seasonal rainfall, thunder represents both fertility and transformation. 

Consequently, rhythmic structures associated with thunder acquire symbolic significance.

 

12.2 Bird Calls and Wind Instruments

The Pepa and Xutulī frequently reproduce sounds heard within forests, wetlands, and riverine landscapes. These instruments preserve acoustic memories of ecological environments. 

Their musical function extends beyond melody and includes the symbolic representation of place. 

12.3 Rivers and Melodic Flow

Eastern India is characterized by extensive river systems. The Brahmaputra and its tributaries have profoundly influenced cultural imagination. 

Many regional melodies exhibit:

 

·         long glides,

·         gradual pitch transitions,

·         flexible rhythmic pacing.

 

These characteristics resemble the continuous movement of flowing water. 

The relationship between rivers and melody therefore constitutes both an acoustic and symbolic reality. 

 

13. Madhyama Grāma and Assamese Musical Consciousness

The present study proposes that the concept of Madhyama Grāma provides a useful interpretative framework for understanding Assamese musical aesthetics. This argument should be understood as a heuristic model rather than a historical assertion. 

Several characteristics of Assamese music correspond to symbolic features commonly associated with Madhyama-oriented aesthetics: 

13.1 Melodic Continuity

Many Assamese musical genres emphasize:

 

·         curved melodic movement,

·         pitch glides,

·         gradual transitions. 

Abrupt tonal shifts are comparatively less prominent. 

13.2 Resonant Vocal Production

Assamese vocal traditions often favor:

 

·         nasal resonance,

·         head voice,

·         open-throat singing,

·         sustained tones. 

These characteristics contribute to a sense of continuity and expansiveness. 

13.3 Emotional Fluidity

Assamese songs frequently move between:

 

·         devotion,

·         longing,

·         celebration,

·         nature symbolism. 

The boundaries between emotional categories remain fluid rather than sharply differentiated.

 

13.4 Ecological Integration

Unlike purely concert-oriented traditions, many Assamese musical forms remain closely connected with:

 

·         agriculture,

·         seasons,

·         rivers,

·         fertility rituals,

·         sacred landscapes. 

Such integration reinforces the relationship between sound and environment.

 

14. Sound, Heritage and Cultural Memory

Modern heritage studies increasingly recognize that cultural memory is not preserved exclusively through monuments and artifacts. Sound constitutes one of the most important carriers of collective memory. 

Songs, chants, melodies, rhythms, and performance practices preserve:

 

·         historical knowledge,

·         social values,

·         ecological awareness,

·         ritual traditions,

·         linguistic identities. 

Many musical traditions survive despite the disappearance of written records. 

The continuity of Bihu, Jāgar, Mālacī Gīt, and related traditions demonstrates the resilience of sound-based cultural transmission. From this perspective, music functions as a living archive. 

 

15. Intangible Cultural Heritage Perspective

The safeguarding of intangible cultural heritage requires attention not only to texts and monuments but also to sound traditions.

The 2003 Convention of the UNESCO recognizes oral traditions, performing arts, ritual practices, and traditional knowledge systems as important dimensions of heritage. 

The musical traditions discussed in this study satisfy several criteria associated with living heritage:

 

·         community transmission,

·         intergenerational continuity,

·         ritual significance,

·         environmental knowledge,

·         cultural identity.

 

Particularly significant is the fact that these traditions continue to evolve while maintaining continuity with earlier cultural forms. Their preservation therefore requires support for both documentation and continued performance. 

 

16. Discussion

The present study has examined the relationship between phonetics, musical aesthetics, ecology, and cultural consciousness through an interdisciplinary framework combining musicology, sound studies, philosophy, and heritage research. 

Several conclusions emerge.

 

                                I.            First, language and music appear to share important acoustic foundations. Habitual patterns of speech influence vocal production and may contribute to regional musical characteristics.

                              II.            Second, ecological environments shape sound perception and musical imagination. Rivers, forests, rainfall, birds, and seasonal cycles all contribute to the formation of regional sound cultures.

                            III.            Third, classical Indian concepts such as Nāda-Brahma, Śūnya, and Grāma remain valuable analytical tools for contemporary scholarship when employed as interpretative frameworks rather than rigid historical categories.

                            IV.            Fourth, Assamese and Eastern Indian musical traditions demonstrate a remarkable integration of ecology, spirituality, ritual, and aesthetics.

                              V.            Finally, sound traditions represent an essential component of intangible cultural heritage and deserve greater scholarly attention. 

 

 

17. Conclusion

This study has explored the hypothesis that the East–West phonetic gradient of the Indian subcontinent may correspond to broader differences in musical aesthetics, vocal production, and cultural soundscapes. 

Drawing upon the philosophical foundations of Nāda-Brahma, the interpretative possibilities of Grāma theory, and the living musical traditions of Assam and Eastern India, the paper has argued that sound functions as a bridge between language, environment, consciousness, and cultural memory. 

The traditions of Bihu, Jāgar, Mālacī Gīt, and related performance systems reveal a musical culture characterized by resonance, melodic continuity, ecological awareness, and symbolic engagement with silence. 

These characteristics may be understood through the complementary concepts of Śūnya and Nāda, where silence becomes the source of sound and resonance becomes the vehicle of cultural continuity. 

The study therefore suggests that Eastern Indian musical traditions should not be viewed solely as artistic expressions but also as repositories of ecological knowledge, philosophical insight, and intangible cultural heritage. 

Future research combining acoustic analysis, ethnographic fieldwork, linguistic studies, and digital sound documentation may further illuminate the complex relationship between sound, culture, and environment within the diverse musical traditions of South Asia.

 

 

 

Footnotes

1. Bharata Muni, Nāṭyaśāstra, Chapters 28–34.
2. Mataṅga, Bṛhaddeśī, discussion of Mārga and Deśī traditions.
3. Śārṅgadeva, Saṅgīta Ratnākara, Book I.
4. Abhinavagupta, Abhinavabhāratī.
5. Daniélou, Alain. The Ragas of Northern Indian Music.
6. Ranade, Ashok Da. Music Contexts: A Concise Dictionary of Hindustani Music.
7. Schafer, R. Murray. The Soundscape.
8. UNESCO Convention for the Safeguarding of the Intangible Cultural Heritage, 2003.
9. Traditional Assamese Bihu performance practices.
10. Oral traditions of Jāgar and Mālacī Gīt in Kāmarūpa-Assam.

 

 

Selected References

• Abhinavagupta. Abhinavabhāratī.
• Bharata Muni. Nāṭyaśāstra.
• Daniélou, Alain. The Ragas of Northern Indian Music.
• Gait, Edward. A History of Assam.
• Jairazbhoy, Nazir Ali. The Rāgs of North Indian Music.
• Mataṅga. Bṛhaddeśī.
• Ranade, Ashok Da. Music Contexts.
• Schafer, R. Murray. The Soundscape: Our Sonic Environment and the Tuning of the World.
• Śārṅgadeva. Saṅgīta Ratnākara.
• UNESCO. Convention for the Safeguarding of the Intangible Cultural Heritage, 2003.
• Regional field materials relating to Bihu, Jāgar, Mālacī Gīt, and Kāmarūpī musical traditions.
• Contemporary studies in acoustic ecology, ethnomusicology, and sound heritage.

 

The preliminary study in this project as  uploaded here for batter understanding of readers:

A geo-acoustic gradient: crossing a river eastward softens phonemes and musical svara; westward hardens them. This is not just folk observation. It maps directly to Indian musicology’s categories of grāma, mārga, bhāva, and Nāda-Brahma. Here’s the musical logic: 

 

1. Phonetic gradient = Timbre gradient in music

In Sangīta Ratnākara, varṇa = articulation, jāti = timbre. East Indian languages like Assamese, Bengali, and Maithili favor anunāsika, mahāprāṇa, and svarita intonation. Phonetics shifts from plosives k (ক), t (ত), p (প) = kathina varṇa to nasals, semivowels, liquids m (ম, n (ন), l (ল), r (ৰ), y (য়) = komala varṇa. 

Musically this = shift from Paruṣa Jāti to Komala Jāti of voice production: 

·         West/Paruṣa: More āghāta = struck articulation. Glottis tense. Timbre = bright overtones, 2nd/3rd harmonic dominant. Feels “hard”. Corresponds to Dakṣiṇa mārga in rhythm: sparse, angular.

·         East/Komala: More anunāda = resonance in nasal/oral cavity. Glottis relaxed. Timbre = fundamental + 1st harmonic dominant. Feels “sweet”. Corresponds to Citra mārga: continuous, flowing. 

So “crossing a river” = crossing a jāti boundary. The river is a physical sandhi where phonetic sandhi rules change. 

 

2. Lāsya bhāva in the East = Musical Tāra Saptaka + Gamak logic

Bhāva-rasa theory links geography to rasa. Lāsya = feminine, graceful, curvilinear movement. Musically it demands: 

·         Tāra Saptaka dominance: High register = small vocal tract tension, thin folds. Acoustically it produces weaker lower harmonics, stronger upper partials. Perceptually “light, sweet, distant” = madhurya. East Indian music, Bihu, Bhāṭiyāli, Baul all exploit tāra ṣaḍja as home note. This matches “soft phonemes” — both avoid heavy chest resonance. 

·         Kampita + Gamak: Oscillation around svara rather than fixed svara. This is anunāda in sound physics: frequency modulation rather than amplitude attack. It mimics “komala dhvani” of speech. The voice never “hits” a note like a hammer; it “arrives” like a breeze. 

·         Śūnyatā → Punahutpatti: “Bring sound to emptiness and regenerate”. This is Nāda-Brahma’s Parā → Vaikharī → Parā cycle. In ālāp, East Indian musicians stretch vilambit to near-silence, then regenerate svara from breath. The “void” is not absence but Parā Nāda, potential. This aesthetic of “return to source” matches the agrarian cycle described: sow → fallow → harvest. 

So Lāsya is the musical correlate of komala varṇa + Madhyamā Nāda = sound as movement, not impact. 

 

3. Instrument-nature isomorphism = Mimesis of Prakṛti Nāda

This is anukaraṇa theory from Nāṭyaśāstra 28.1. Art imitates loka-dharmi sound to create bhāva. But deeper: each instrument occupies one layer of Nāda-Brahma descending from nature: 

 

Instrument	Acoustic property	Storm/Nature analog	Nāda level	Musical role
1	2	3	4	5
Pepā /Sutuli	High pitch, short decay, noise component	Cicada, raindrop	Vaikharī → Bindu	Mātrā kaṇa. Provides tāla + citra texture. East = more noise, less pitch = “soft”.
Dhol	Low fundamental, long decay, formants at 80-120Hz	Cloud thunder	Vaikharī	Guru. Provides pūrṇa/matter. Chest resonance = body’s earth.
Gagana /Jew’s harp	Inharmonic, no fixed pitch, jaw resonance	Wind śūnya-nāda	Madhyamā	Khālī. Fills gap between beats. Embodies emptiness-as-sound.
Mohar śingar pepā	Very low, breathy, subharmonic	Bull call for fertility	Paśyantī	Sphuraṇa. Intent-before-sound. Ritual trigger.

 

All these avoid Paruṣa attack. Even Dhol in Bihu uses open palm, stick used in Bāyā = softer attack envelope. This is musical “komalata”. 

4. Total aesthetic = Prakṛti-vandana through Svara-Tāla-Angika

This is Sādhāraṇīkaraṇa — aesthetic universalization. East Indian arts collapse the boundary between nāda and prakṛti: 

1.       Svara: Uses komala ri, ga, dha, ni more freely. Microtonal slides meṇḍ imitate river bends, wind curves. No sharp sphuṭa = no “hard phoneme”.

2.       Tāla-māna: Prefers dakṣiṇa → vārtika expansion. Gaps between beats widen. This mirrors agricultural time: seasons, not factory time. Silence = fallow field. Beat = seed.

3.       Angika/Body lāsya: Tribhaṅga, circular hand mudrā, hip sway = sine wave, not straight line. Physics: sine = least energy, most “soft”. Matches komala phonetic airflow. 

Thus the “musical logic” is: East = expansion of Madhyamā/Śūnya + compression of Āghāta. West = expansion of Āghāta + compression of Śūnya. 

5. Formulaic summary

From Nāda-Brahma framework in the passage: 

West: Paruṣa Varṇa + Āghāta Nāda + Citra Mārga = Karkasha Svara + Śūnya contraction 

East: Komala Varṇa + Anunāda Nāda + Dakṣiṇa Mārga = Madhura Svara + Śūnya expansion 

The river is the sandhi-sthāna where guru → laghu ratio shifts. Eastward cultures preserve more laghu/khālī = silence, which musicology treats as rasa-ādhāra. Without silence, madhurya cannot exist. That’s why the narrative ties soft speech, Lāsya, high tāra, gamak, and nature-mimicry together: they are all strategies to maximize śūnya while keeping svara intelligible. 

In short: A sophisticated acoustic geography. “Softness” is not weakness, but higher ratio of Madhyamā Nāda to Vaikharī Nāda. That ratio produces madhurya rasa and Lāsya bhāva, which the instruments, voice, and dance then embody as “nature’s music”. 

Sangīta Ratnākara calls a shift between Ṣaḍja Grāma and Madhyama Grāma. The river is not just geography — it’s an acoustic grāma-sandhi. 

 

6. What Grāma means musically

Grāma = “scale + tonal center + interval matrix + social ethos”. There are 3 grāma-s: Ṣaḍja, Madhyama, Gāndhāra. After Gāndhāra Grāma was lost, the East-West divide is best explained by Ṣaḍja Grāma vs Madhyama Grāma. 

Formula from Ratnākara:

 

Ṣaḍja Grāma: S-R-G-M-P-D-N-S' with 22 śruti

 

Madhyama Grāma: M-P-D-N-S-R-G-M'  with M as tonal center 

 

7. West = Ṣaḍja Grāma : “Karkasha + Kathina” 

Logic behind “hard sound, harsh voice”: 

1.       Tonal center = Ṣaḍja: Chest voice, mandra saptaka anchor. Ṣaḍja = 1st harmonic, strongest, most “grounded”. Physically this = tense vocal folds, more āghāta. Result: bright overtones, plosive consonants. That’s Paruṣa Jāti = “kathina dhvani”. 

2.       Interval structure: In Ṣaḍja Grāma, M and P are 4 śruti apart = large 3rd. Gaps between svara are bigger. Musically this = angular melodies, clear “edges” between notes. Corresponds to “karkasha svara” + Citra mārga = dense articulation, less slide. 

3.       Aesthetic: Ṣaḍja Grāma → Veera, Raudra, Adbhuta rasa. Associated with Tāṇḍava, straight anga-bhaṅga, guru-heavy tāla. This matches the narrative’s “west = hardness”. 

So West = more Vaikharī Nāda + less Madhyamā Nāda. Sound is “matter-heavy”.

 

8. East = Madhyama Grāma : “Madhura + Komala” 

Logic behind “soft sound, sweetness, Lāsya”: 

1.       Tonal center = Madhyama: Throat/nasal voice, madhya saptaka anchor. Madhyama = 4th, “middle” harmonic. It has weaker fundamental, stronger 2nd/3rd partials, more formant energy in 1-2 kHz. Physically = relaxed vocal folds, more anunāda. Result: softer consonants, nasalized vowels, komala varṇa. That’s exactly “purba dike dhvani komal hoy”. 

2.       Interval structure: In Madhyama Grāma, G and M are only 3 śruti apart = smaller 2nd. Svara cluster closer. Musically this = meṇḍ, gamak, kampita become natural. Notes “glide” into each other. No sharp edges = “madhurata”. This is Dakṣiṇa mārga expanded — more silence/gap between svara events. 

3.       Aesthetic: Madhyama Grāma → Śṛṅgāra, Karuṇa, Śānta rasa. Associated with Lāsya, tribhaṅga, laghu-heavy tāla. The passage’s “jīvan saral, atmīyatā, narīr mān-maryādā, prakṛtir logot mili basasthān” = Śānta + Śṛṅgāra ethos of Madhyama Grāma. 

So East = more Madhyamā Nāda + Parā Nāda return. Sound is “void-heavy”. 

 

9. Why Assamese/Bihu instruments prove “Madhyama Grāma” orientation 

Madhyama Grāma acoustic correlate 

·         Tāra Saptaka + easy glide Udārā → Tāra

Madhyama as nyāsa makes upper register light. Voice doesn’t have to “push” from heavy Ṣaḍja. Glide = small 3-śruti intervals. 

·         Kampita dhvani, gamak

Madhyama Grāma has compressed śruti spacing. Oscillation between G-M or N-S is musically “built-in”. Ṣaḍja Grāma would sound out-of-tune doing same gamak. 

·         Pepa, Sutuli, Gagana = nature sound

Madhyama Grāma treats anāhata + noise as valid svara. Gagana has no fixed pitch = aśruti = allowed in Madhyama aesthetic of śūnya. Ṣaḍja Grāma demands fixed svara. 

·         Dhol but open palm, with stick in Bāyā

Reduces āghāta; Lowers 2nd/4th harmonic attack. Makes dhol behave like Madhyama drum: resonance > attack. Same logic as “soft phoneme” 

·         Śūnyatā → punarutpatti

Madhyama Grāma philosophy: M is “middle” between S and P. It naturally resolves to silence then back. Ṣaḍja Grāma resolves to S = grounded, less “void”. 

 

10. Formula: East-West as Grāma ratio 

Let A = Āghāta component, M = Madhyamā/Śūnya component 

West = ^A/_M > 1 = Ṣaḍja Grāma dominance 

East = ^A/_M < 1 = Madhyama Grāma dominance 

Crossing the river = crossing where A/M = 1. East of it, musicians unconsciously choose instruments + phonemes + gamak that minimize A and maximize M. 

 

11. Scholarly conclusion

It is describing deśī mārga vs. mārga distinction from Nāṭyaśāstra. “East = Lāsya” = deśī mārga rooted in Madhyama Grāma. Its musical logic is: 

1.       Phonetic softness = Komala śruti spacing. Speech and music share same vocal tract setting.

2.       Lāsya = Madhyama as tonal center. Lighter body, higher register, curvilinear motion.

3.       Nature-mimicry = acceptance of Anāhata + Aśruti. Madhyama Grāma aesthetics allow “non-pitch” sound like wind/insects as music.

4.       Śūnya expansion = Dakṣiṇa mārga tāla. Agrarian time-sense needs long khālī between guru beats. 

Assamese musical logic is Madhyama Grāma logic. The “river” is the acoustic boundary where Indian music shifted from S-centric to M-centric tonality. That’s why Bihu, Bhāṭiyāli, Goalini all sound “soft, sweet, high, gliding” compared to Hindustani Khyāl or Carnatic Kṛti rooted in Ṣaḍja Grāma. 

Sangīta Ratnākara divides the octave into 22 śruti = microtones. The East-West “softness” is literally 1 śruti difference between G and M. 

12. Śruti structure of the two Grāma-s

 

Ṣaḍja Grāma — West/“Karkasha” orientation; Ṣaḍja = tonic 

S -4- R -3- G -4- M -4- P -3- D -4- N -4- S' 

Total = 22 śruti

 

Madhyama Grāma — East/“Madhura + Komala” orientation; Madhyama = tonic 

M -4- P -3- D -4- N -4- S -4- R -3- G -4- M' 

Total = 22 śruti

 

Key difference: Look at G-M interval

 

Grāma	G-M gap	Cents approx	Musical feel
1	2	3	4
Ṣaḍja Grāma	4 śruti	4/22 × 1200 ≈ 218 cents	Wide 2nd. Feels like a “step”. Clear edge between notes = karkasha
Madhyama Grāma	3 śruti	3/22 × 1200 ≈ 163 cents	Narrow 2nd. Feels like a “slide”. Notes merge = madhura + komala

 

1 śruti ≈ 54.5 cents; That 54.5 cent difference is what your ear hears as “hard vs soft”. 

 

13. Why gamak (kampita) sounds sweet in East = Madhyama Grāma 

Gamak = oscillation around a svara. Take oscillation on Gandhāra:

 

In Ṣaḍja Grāma, 4 śruti gap: 

If you do kampita between G-M, you’re oscillating across 218 cents. 

 

·         Physics: Ear hears this as 2 distinct pitches fighting. Harmonics clash at 4th/5th partial.

 

·         Result = “bright, sharp, tense” = karkasha dhvani. This matches West’s speech: plosives + sharp vowels.

 

In Madhyama Grāma, 3 śruti gap: 

Same kampita between G-M is only 163 cents. 

·         Physics: Harmonics of G and M now overlap at 2nd/3rd partial. Brain fuses them into 1 “blurred” pitch with vibrato.

·         Result = “soft, sweet, liquid” = madhura dhvani. This matches East’s speech: nasal vowels + liquids l (ল),  r (ৰ), y (য়).

 

So when Assamese singers do meṇḍ Udārā → Tāra, they’re exploiting 3-śruti gaps. Voice can glide without hitting “edges”. That’s “svar sahaje gati korab pora khomota”. 

 

14. Tāra Saptaka ease = Madhyama as center 

1.       Ṣaḍja Grāma: To reach Tāra Ṣaḍja from Mandra, voice must climb S→R→G→M→P = 15 śruti. Heavy chest pull = “kathina”. 

2.       Madhyama Grāma: To reach Tāra Madhyama from Madhya, voice climbs M→P→D→N→S = 15 śruti but starting from throat, not chest. Starting point is already 4th harmonic, so overtones are lighter. Result = “Tāra Saptakar swar, komorito dhvani” with less strain. 

This is why Bihu, Bhāṭiyāli singers live in tāra register. Their grāma makes high notes feel “natural” not “strained”. 

 

15. Śūnya expansion = 3-śruti gaps create more “space” 

Music = sound + silence. Wider gaps = less silence possible before it sounds like a jump. 

1.       Ṣaḍja Grāma, 4 śruti gap: If you leave >2 śruti silence, listener hears “note → jump → note”. Silence feels like break. So music stays Citra mārga = dense. 

2.       Madhyama Grāma, 3 śruti gap: You can leave 3-4 śruti silence and ear still hears it as “one gesture”. Silence becomes gamak itself. This is “dhvani śūnyatāt ani punorutpatti”. The laghu/khālī portion expands = Dakṣiṇa mārga.

Formula: Śūnya capacity  µ ¹/_{śruti gap} 

Smaller śruti gap = more silence the ear can absorb without losing melodic thread.

 

16. Instrument correlation

 

Instrument	Why it fits Madhyama Grāma 3-śruti logic
1	2
Pepā	Only 6-7 notes, but all within 3-śruti clusters. Can’t play wide 4-śruti jumps cleanly. So it “slides” like voice.
Gagana	No fixed pitch = infinite 1-2 śruti oscillation. Embodies Madhyama Grāma’s acceptance of a śruti as music.
Sutuli	Clack = noise burst, not pitch. Noise fills the 3-śruti “micro-gaps” between svara. Makes komala texture.
Dhol open palm	Attack envelope = slow. Fundamental rings 3-4 śruti longer before 2nd harmonic dominates. Soft attack = anunāda not āghāta.

 

              

Summary 

It describes Grāma-parivartana at the river: 

1.       West = Ṣaḍja Grāma: 4-śruti G-M gap → discrete notes → plosive speech → Paruṣa Jāti → Tāṇḍava → Karkasha svara. 

2.       East = Madhyama Grāma: 3-śruti G-M gap → sliding notes → nasal/liquid speech → Komala Jāti → Lāsya → Madhura svara. 

That 1 śruti = 54.5 cents difference is the entire musical logic. It makes gamak sweet, tāra easy, silence wide, and instruments “nature-like”. 

In Nāda-Brahma terms: Ṣaḍja Grāma emphasizes Vaikharī = struck sound. Madhyama Grāma emphasizes Madhyamā = mental sound/throb. East India chose the latter, so their music sounds like wind + rain, not hammer + stone.