The baritone horn is a low-pitched brass instrument.[2] Baritone horn is a piston valve brass instrument with a predominantly cylindrical bore like the trumpet[3] and uses a wide-rimmed cup mouthpiece like that of its peers the trombone and euphonium, for like the trombone and the euphonium, the baritone horn is pitched in B♭ one octave below the B♭ trumpet.
In the UK the baritone is frequently found in brass bands. The baritone horn in the United States is common in school and university bands, the baritones found in school inventories often being older models as the instrument over time appears to be yielding in popularity to the euphonium.
A person who plays a baritone horn is a baritone (horn) player or baritonist.