If you have been working on playing scales, chords, and harmony in general, this set is the next step towards getting your ears and fingers coordinated. This set is a continuation of Volume 3, but in much more depth. Features 23 audio tracks and most go through all 12 keys! The first two albums contain slow practice versions and the second set of albums contain medium/fast versions. Rhythm Section: Jamey Aebersold (p); John Clayton (b); Mike Hyman...