Woodwind instrument pitched one octave below the soprano clarinet. Provides a sonorous, woody bass sound for concert bands, marching bands, and clarinet ensembles. Heard on songs such as the Beatles' "When I'm Sixty-Four" and Tennessee Ernie Ford's "Sixteen Tons".

On the other hand, if you really want some bass, you should take a look at the contrabass clarinet or the octocontrabass clarinet, pitched two and three octaves below the soprano, respectively.