Music splits along the same fault line as language and drawing: a memorisable half and a physical half. The memorisable half is larger than people assume. Note-reading is mostly fast recognition, sight-reading even more so. Intervals, chord shapes, key signatures, the geography of a keyboard or a fretboard, and ear training (this interval is a fifth, this one is a minor third) are all recognition under time pressure, which is exactly Anki’s strength. Ear training as flashcards is a particularly natural fit: the sound on the front, the named interval or chord on the back, the same structure as my Japanese listening cards. The physical half, actually playing, Anki can only put on a recurring “do this” schedule, not drill into your fingers. I’ve thought about this more than I’ve done it, but the structure is the one running through every section here: Anki is excellent at the recognition layer of a skill and merely a scheduler for the motor layer.