Rhythm Changes in 12 Keys is Book II in the " Constructing Walking Jazz Bass Lines " series for the Double Bassist and Electric Jazz Bassist.Rhythm Changes in 12 Keys compliments Book I " The Blues in 12 Keys " by following on with an in depth study of " must know " Jazz chord progressions for the aspiring Jazz Bassist.Rhythm Changes in 12 Keys is a complete guide demonstrating how to construct walking jazz bass lines in the jazz tradition. Part 1 of the book outlines and demonstrates the various techniques used by professional Jazz Bassists to provide forward motion and a strong harmonic and rhythmic foundation into bass lines. Part 2 of the book outlines Rhythm Changes in 12 keys with over 70 choruses of professional jazz bass lines.for Beginner to Advanced students.