Jerry's book is excellent for jazz instrumentalists. It logically guides the player through patterns and sequences that form the constructs of jazz improvisations. Although explanations and discographies are interspersed through-out, this book is meant to be played, rather than read in an armchair. It starts off with major and minor triads, 6th, 7th and 9th patterns and gradually advances to complex patterns based on whole tone, diminished, altered ninth, augmented, polychords, turn-arounds, chromatics and more. The patterns flow in whole steps, 3rds, cycles, etc. Each pattern gives a suggested range for the metronome and the player must transpose the patterns to all twelve keys before moving on to the next pattern. The transposing really challenges the player, because after displaying the pattern in 1 or 2 keys, the player must transpose to the other keys (the appropriate chord symbol is always provided). If the player is willing to take his/her time and go through the book as designed, his/her virtuosity, technique and improvisational freedom will increase gradually and significantly to a very high degree. Highly recommended.