B
ballad

Usually a slower-tempoed song with voice as the primary instrument.

backbeat

Usually beats 2 and 4 of a measure in popular music.

bar

Measure. Also where bands play.

bass

Low-pitched range of sound. Also a low-pitched instrument such as a bass guitar or an upright double bass.

bass player

Musician who can be replaced by a pianist's left hand.

beat

A unit of musical time; a subdivision of a measure. The pulse of a song.

bpm

Beats per minute. Relates musical time to conventional time and defines the tempo.

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