Ellington blended muted trumpet, muted trombone, and clarinet. Versions also exist for double bass, clarinet, horn, flugelhorn, flute, oboe, bassoon, trombone, and percussion. The trombonist doubles on bass trombone and tuba. Examples include the trumpet, cornet, horn, trombone and the tuba. He also studied the clarinet, trombone and harmonica. A brass quartet features two trumpets, a trombone and a tuba. Brass instruments included the cornett, natural horn, Baroque trumpet, serpent and the trombone. It is in the same range as a tuba or a contrabass trombone. The instrument is the ancestor of both the trumpet and the trombone. Very little call for saxes, trombone or flute. The modern system has seven chromatic slide positions on a tenor trombone in B. All parts apart from the bass trombone and percussion are now written in treble clef. Some trombones have valves instead of a slide (see valve trombone). It uses a wide-rimmed cup mouthpiece like that of its peers, the trombone and euphonium. The name of the instrument is a portmanteau of "trombone" and "bassoon".