Domain #4 : mārga / gīti / pada-style (temporal frame of song-rendering) 6c.3

The three mārgas of the ancient tāla system (Nāṭyaśāstra heritage).

"mārga" = path; the span of a tāla. NŚ enumerates three mārgas per tāla
in a doubling ratio: citra (shortest), vārtika (×2 citra),
dakṣiṇa (×2 vārtika).

evidence: R_marga_def, R_2230_three_margas_tala (aff#1908, aff#3154)

The fundamental opposition: structured-ancient (mārga) vs regional
(deśī).

deśī = regional/ethnic music, fundamentally tied to a region or people
(śabara, pulinda, kāmboja, baṅga, kirāta, bāhlīka, āndhra, draviḍa, …).
The opposition is structural: deśī begins with a group of four svaras,
mārga does not.

evidence: R_346_desi_definition, desi_definition_regional_ethnic,
          R_509_marga (aff#184, aff#186, aff#1853, aff#2905, aff#2907)

The three kalā-based tāla divisions tied to the mārgas.

Each kalā has a fixed mātrā-duration; the kalā-tāla of a mārga is
determined by the size of the metrical unit ("on account of the use of
N-mātrā units").

evidence: R_108_dvikala_definition,
          ekakala_in_citra_marga (aff#2732),
          R_1897_001 (aff#2733),
          catushkala_tala_daksina_marga (aff#2731)

The three yatis = order/sequence of layas in a piece.

evidence: yati_definition_and_types (aff#3167, aff#1996),
          sama_yati_uniform_laya, gopuccha_yati_definition,
          srotogata_yati_definition

The three layas (tempi) cited as predominating in mārgas.

evidence: R_86_citra_marga_composition (druta laya in citra),
          R_573_vartika_marga (madhya laya in vārtika),
          daksina_marga_attributes (vilambita laya in dakṣiṇa)

The three pāṇis = phasing of song-onset vs tāla-onset.

Each pāṇi is equated with a graha (point of song-entry):
  uparipāṇi  ≡ anāgata graha  (instrument first, song later)
  samapāṇi   ≡ sama graha     (simultaneous)
  avapāṇi    ≡ atīta graha    (song first, instrument later)
             ≡ adhaḥpāṇi      (synonym)

evidence: R_2243_uparipani_anagata (aff#3175),
          BD_6_1_R008 (aff#3174, aff#3186),
          R_86_citra_marga_composition (uparipāṇi in citra),
          R_573_vartika_marga (samapāṇi in vārtika),
          daksina_marga_attributes (avapāṇi in dakṣiṇa)

The three grahas — paired one-to-one with the pāṇis.

evidence: R_2243_uparipani_anagata, BD_6_1_R008

The four pada-gīti categories of Bharata, cited by Mātaṅga.

Note: a fifth gīti name (Gauḍī gīti, R_1472_01 / gauda_giti_definition)
appears in the Brihaddesi but in a different (rāga-rendering) context,
not as a pada-gīti category — kept out of this enum.
The 5-gīti list (śuddhā/bhinnā/gauḍī/vesarā/sādhāraṇī) cited in some
secondary literature is NOT formalised here: no rule in the 82-rule set
enumerates it for the pada-gīti axis — see UNRESOLVED.

evidence: R_padagitis_section, R_66_sambhavita_definition,
          R_4p0_010, R_c85_magadhi, R_4p0_019

Syllabic units used to characterise gīti composition.

evidence: R_66_sambhavita_definition (sambhāvitā = guru-dominant),
          R_5p2_586 (pṛthulā = laghu-dominant),
          R_86_citra_marga_composition (guru+laghu+druta in citra),
          r_brd_506_druta_notation (druta = 1/2 mātrā)

The "limb" (avayava) of a mārga — a structural feature of the
instrumental-vocal coupling.

evidence: R_86_citra_marga_composition (ogha in citra),
          R_573_vartika_marga (anugata in vārtika),
          daksina_marga_attributes (tattya in dakṣiṇa),
          R_2236_gitanuga_vadya_varieties (ogha + anugata definitions)

The four-rank ordering of pada-gītis in Bharata's classification.

evidence: R_c85_magadhi (māgadhī rank=1), R_4p0_019 (ardhamāgadhī rank=2),
          R_66_sambhavita_definition (sambhāvitā rank=3),
          R_4p0_010 (pṛthulā rank=4)

Static co-attribution bundle for a mārga.

Every field has at least one supporting affirmation; see comments above.

Static profile of a pada-gīti category.

`dominant_syllable` = the syllable kind that predominates by source rule;
`bharata_rank` = ordinal in Bharata's classification (1..4);
`home_mārga` = the canonical mārga of this gīti (the one whose
               MārgaProfile.gīti points to it);
`unit_matras` = mātrās per gīti-unit in the home mārga (if pinned).

Three vṛttis distinguished by predominance of song vs instrument.

evidence: R_1907_vrtti_enumeration (aff#2745)