What is a Clarinet in Bb?

A clarinet in B♭ is a type of transposing woodwind instrument that sounds a whole step lower than the written pitch. When a player reads and plays a written C on the instrument, the actual sounding pitch is B♭.

The B♭ clarinet is the most common member of the clarinet family and is widely used in orchestras, concert bands, jazz ensembles, and chamber music. It has a wide range and is known for its flexible tone, which can sound warm and mellow in the lower register and bright and expressive in the upper register.

Because it is a transposing instrument, music for the B♭ clarinet is written one whole step higher than concert pitch. This allows clarinetists to use familiar fingerings while producing the correct sounding pitches when playing with other instruments.