A large conical bore brass instrument pitched in Bb found in brass bands, concert bands and occasionally orchestras.

Similar to Baritone Horns but larger in size, Euphoniums are the second largest instrument in the brass family (after the tuba) and well known for having a beautiful dark tone. A variety of different configurations are available including 3 or 4 valve instruments (usually piston) with or without compensating systems. Euphoniums use the same mouthpieces as large bore trombones and baritone horns.