About the workshop
PartWrite Harmony Lab is a four-voice workshop, not a chord dictionary and not another flashcard stack. You write on a color-stemmed SATB pad—pitch pickers, duration chips, accidentals, drag-to-retune, long-press rests—with range shading so each voice stays honest.
Hit the rules engine and it flags parallel fifths and octaves, voice crossing, wide spacing, illegal doubling, unresolved leading tones, and direct perfect intervals, each with a fix you can actually use. Lock a figured bass from the shipped deck, fill the upper parts, or work species 1–5 against a cantus firmus shelf with species-aware dissonance checks.
Homework becomes studio time before anyone else sees the page—drafts stay on-device, no account, no gallery of half-finished chorales on a server.
Label Roman numerals and cadences, spin the circle-of-fifths atlas, solo or mute voices in AVFoundation playback, loop a bar range, then export PDF/PNG. Built for AP Music Theory students, choir section leaders, church pianists, and conservatory freshmen who need the bench, not the dictionary.