A beat is a unit of musical time; when you tap your foot to music, each tap is a beat. Depending on the context, the beat may denote either

• the onset of the corresponding time unit, a point in time, the very moment when the tapping foot hits the floor, or

• the complete time interval between two consecuteve taps, so to say, or

• the whole sequence of individual beats.

Much music is characterised by a sequence of stressed and unstressed beats organised into a meter and indicated by a time signature, the speed of which is determined by a tempo. In the context of a time signature, the term "beat" most often means the denominator; so in 3/4, most people would consider the beat to be the 4, that is, a quarter-note or crotchet.

Musicians, however, typically find that mentally counting a regular series of beats enables them to keep synchronised even if the music is not characterised by regular rhythm.