The baritone horn, or sometimes just called baritone, is a low-pitched brass instrument in the saxhorn family. It is a piston-valve brass instrument with a bore that is mostly conical, like the flugelhorn and alto (tenor) horn, but is narrower than the conical bore of the euphonium.
The contrabass bugle (usually shortened to contra or simply called the marching tuba) is the lowest-pitched instrument in the drum and bugle corps and marching band hornline. It is essentially the drum corps' counterpart to the marching band's sousaphone: the lowest-pitched member of the hornline, and a replacement for the concert tuba on the marching field.
The Wagner tuba is an infrequently-used brass instrument that combines tonal elements of both the French horn and the trombone. Wagner tubas (or Wagnertuben) are also referred to as Wagner horns or Bayreuth tubas in English and as Bayreuth-Tuben or simply Tuben in German.