Jazz progressions

There are 27 progressions here and 118 hand positions between them, drawn from the harmony bible inside the app. Turnarounds and endings are written in C; each blues form sits in the key the source gives it.

None of this is a tune. These are the devices tunes are made of — the two bars that send a chorus back to the top, the cadence that stops it, the twelve bars a jam session is most likely to call. What the app adds to them, and what a chord chart never does, is the octaves: a left hand and a right hand, transcribed, drawn on a keyboard wherever the transcription separates the hands. Where it does not — a bar carrying two chords at once — the chords are printed and the page says why nothing is drawn.