High Quality Content by WIKIPEDIA articles! The Wagner tuba is a comparatively rare brass instrument that combines elements of both the French horn and the tuba. Also referred to as the "Bayreuth Tuba", it was originally created for Richard Wagner`s operatic cycle Der Ring des Nibelungen. Since then, other composers have written for it, most notably Anton Bruckner, in whose Symphony No. 7 a quartet of them is first heard in the slow movement in memory of Wagner. The euphonium is sometimes used as a substitute when a Wagner tuba cannot be obtained.