sentences:  The bass trumpet is frequently featured in "Der Ring des Nibelungen", playing solos in every register, as well as playing in octaves, unison or harmony with trumpets, trombones, and Wagner tubas.Its very distinctive timbre is easily identifiable and Wagner used this new and unique tone colour extensively.However, as with the Wagner tuba and the contrabass trombone, Wagner's other additions to the opera house orchestra for "Der Ring des Nibelungen", the bass trumpet has not become a regular member of the orchestral brass and is seen rarely.