mc-symbolic-score

Map spec fields to ABC headers (T:, M:, L:, Q:, K:) and body elements, using letter chords in quotes and section comments. For YuE2 specifically, use L:1/32 durations, w: lyric lines, and V: Vocal headers so the model executes the score rather than guessing.

Use ABC when feeding YuE2, MusicXML when handing scores to human musicians (it carries articulation and notation intent), and MIDI when you need continuous control like CC curves and micro-timing offsets. ChordPro suits guitarists and rehearsal.

Yes. MIDI is the only format where push_pull is exact, because note positions can be written as precise tick offsets. ABC and MusicXML cannot carry micro-timing, so validating push_pull requires rendering aligned and offset versions in MIDI.

Early stopping usually comes from the L: unit length; YuE2 expects L:1/32, and L:1/16 makes it treat the score as half length. Unintelligible vocals come from long note durations, low register, and missing w: lyric lines; write the vocal line in the lowercase octave with four to six notes per bar.

Run three checks: parse the syntax, confirm the total bar count equals the sum of section bars and that letter chords reverse-map to the spec's roman numerals, then do a minimal render listen for structure only. The bar-count check catches the most common emitter bug.

ABC cannot carry continuous control curves, micro-timing offsets, or full articulation marks, and it only partially preserves notation intent. Fields like subtraction events or per-instrument entries must be passed through style text instead of the score itself.