The baritone horn is a low-pitched brass instrument. It is a piston valve brass instrument with a predominantly cylindrical bore like the trumpet and uses a wide-rimmed cup mouthpiece like that of its peers the trombone and euphonium. Like the trombone and the euphonium, the baritone can be considered either a transposing or non-transposing instrument. In the UK the baritone is frequently found in brass bands.