Book excerpt: One of the best ways to grow as a musician is to emulate the great masters of your instrument. In this volume of Long Tone Duets, trombone players have the opportunity to improve by playing along with Ralph Sauer, long time principal trombonist of the Los Angeles Philharmonic. This edition not only captures Mr. Sauer's sound on an included CD, but also reflects some of his teaching ideas embedded in the duets. By playing along with the CD, you can match Mr. Sauer's clear tone, exquisite intonation, and superb articulation.