Book excerpt: (Instructional). Exercises and Etudes for the Jazz Instrumentalist is a collection of original pieces by the master trombonist/composer J.J. Johnson. Designed as study material and playable by any instrument, these pieces run the gamut of the jazz experience, featuring common and uncommon time signatures and keys, and styles from ballads to funk. They are progressively graded so that both beginners and professionals will be challenged by the demands of this wonderful music.