Berkee Press has a Book/CD called: Playing The Changes: Bass. Anyone know if it's any good? __________________________________________ "In Playing the Changes: Bass, Paul Del Nero presents a unique improvisation strategy based on ear training and a linear interpretation of note relationships. In this technique, improvised lines are derived from the harmonic construction of chord progressions. Learn how to choose appropriate notes by listening for the tendencies of pitches within modes and tetrachords - groupings of four notes in a scale. In Playing the Changes: Bass, you'll explore the possibilities of focused and linear improvisation, and develop your ability to create musically effective melodies with greater freedom and depth of expression."