Doug Ruby shows off his chops on the Euphonium. The Euphonium has been called the ‘king of band instruments’, or the ‘cello of the band’, because of its similarity in timbre and ensemble role of the cello. Euphoniums are wildly used in many marches, and in brass band music of the British tradition.  While the euphonium was not historically part of the standard jazz big band or combo, the instrument’s technical facility and large range make it well-suited to a jazz solo role.