The 50 Etudes by Boris Grigoriev are inspiring and diverse examples of romantic etude writing. Originally written for tuba, they are transposed and adapted for tenor and bass trombonists by Randall Hawes, bass trombonist of the Detroit Symphony Orchestra. Mastering the use of alternate positions is a crucial building block to developing excellent slide technique leading to a smooth and beautiful legato sound. The common sense use of the valves-and slurring while using the valves-are essential skills. Mr. Hawes offers instructive text and musical examples to achieve these goals.