Rhythm Changes
Rhythm changes is the second most-played form in jazz after the blues: a 32-bar AABA shape whose A sections are built on turnaround motion and whose bridge is a chain of dominants. The trainer will let you drill the A and B sections separately or loop the whole form, in any key.
All twelve keys
In C: C△7 · Am7 · Dm7 · G7 · C7 · F△7 · F♯°7 · E7 · A7 · D7. Each page loops the form with a vamp, shows the chord-scale for every chord on piano and guitar, and lets you tap any note.