The bass clarinet is a musical instrument of the clarinet family. Like the more common soprano B♭ clarinet, it is usually pitched in B♭ (meaning it is a transposing instrument on which a written C sounds as B♭), but it plays notes an octave below the soprano B♭ clarinet.[1] Bass clarinets in other keys, notably C and A, also exist, but are very rare. Bass clarinets regularly perform in symphony orchestras, wind ensembles, and play an occasional solo role in contemporary music and jazz in particular.
Source: Wikipedia
