Practice with Bach - Vol.1 (Tuba) Ralph Sauers landmark new work, Practice With Bach, will challenge your technique and musicality with demanding new études. Based on the keyboard works of J. S. Bach, each of the Three Volumes is available in five different versions--Alto Trombone, Tenor Trombone, Bass Trombone, Euphonium, and Tuba. Each version is customized for the individual instrument (choice of key, range, ornaments, etc.). Volume One contains Twenty-four études in all keys, based upon preludes from The Well-Tempered Clavier.