Book and CD. Tune-In, Tone Up, and make practicing fun! Includes 10 intermediate to advanced straight-ahead jazz etudes and 20 duets with a play along CD of 34 MP3 audio tracks. The CD tracks (except for the last 12 duets which contain only one chorus) include extra choruses for working on your improv chops. Most are based on standard chord changes. Also available in C, Eb, and Bass Clef books, so you can play duets with anyone without the need to transpose.