mcp_opendaw_create_ternary_form
Compose an ABA ternary form with a contrasting B section. Choose contrast type (trio, dominant, relative, etc.), set key and bar counts, and optionally ornament the A return.
Instructions
Create ternary form — ABA with contrasting middle section.
Ternary form (ABA) is one of the most fundamental structures in Western music. The outer A sections are related (often identical, or A' with ornamentation), while the middle B section provides contrast. Used in:
Minuet & Trio (Haydn, Mozart): A=minuet, B=trio, A=minuet da capo
Da capo aria (Baroque opera): A=main aria, B=contrasting middle emotion, A=ornamented return
Chopin Nocturnes: A=lyrical theme, B=agitated middle, A=ornamented
Pop/jazz ballads: A=head, B=bridge/solo, A=head out
B section contrast types:
trio: Subdominant key (IV), smoother rhythm, thinner texture. Classical minuet & trio.
dominant: Dominant key (V), more active rhythm, builds tension. Beethoven scherzo style.
relative: Relative minor/major, darker/lighter character. Schubert impromptu middle sections.
episode: Same key, completely different melodic material. Chopin nocturne B sections.
development: Fragmentation of A material, modulating. Late classical/romantic expansion.
A' (return): If a_prime_ornamented=True, adds passing tones, trill-like ornaments, and slight rhythmic variation to the A material. Da capo aria / Chopin nocturne practice.
Melody on track_index, bass on track_index+1.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| a_bars | No | ||
| b_bars | No | ||
| key_root | No | C | |
| velocity | No | ||
| b_contrast | No | trio | |
| scale_name | No | major | |
| start_beat | No | ||
| unit_index | No | ||
| track_index | No | ||
| a_prime_ornamented | No |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |