songbird-theory

Music theory primitives — scales, chords, progressions, note parsing.

What it owns

Scale and chord representations and the database of named scales/tunings.
Note name ↔ MIDI number conversions.
Progression and sequencing helpers built on top of scales.

Public API

Chord, Scale, Progression, ScaleDatabase, ScaleDefinition.
note_from_number, midi_from_note_name, midi_from_chord_name.

How it fits

Pure-data crate. Used by songbird-composition. No workspace deps; serde only.

Tests

cargo test -p songbird-theory.