Clarinets in C

Most clarinets being used are in the key of Bb. Clarinets in C are mostly being used to avoid the player having to transpose if the part being played is written for C clarinet, for example much of the Classisical repertoire, or if they want to play straight from a hymn sheet or song sheet which are in “concert pitch”. The C clarinet does have a different, slightly brighter, sound however, & some clarinetists use it for that reason.