12 Contemporary Jazz Etudes for Bass Clef Instruments (Trombone, Baritone Horn, Tuba) is written by Bob Mintzer. Designed for the medium to advanced difficulty level, this book includes: 12 jazz etudes in a variety of jazz styles, tempos, & time signatures. Performance notes/tips for each etude to assist in interpretation & improvisation. Play-along CD with a stellar rhythm section. All books are compatible & written so they can be performed together.