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BPM

Beats per minute (BPM) is a unit typically used as a measure of tempo in music and heart rate. The BPM tempo of a piece of music is conventionally shown in its score as a metronome mark, as illustrated to the right. This indicates that every one minute there should be 120quarter notes (or crotchets) (1/4). In simple time signatures it is conventional to show the tempo in terms of the note duration on the bottom. So a 4/4 would show a quarter note, as shown to the right, while a 2/2 would show a minim (or half note).

In compound time signatures the beat consists of three note durations (so there are 3 quavers (eighth notes) per beat in a 6/8 time signature) (1/8), so a dotted form of the next note duration up is used. The most common compound signatures: 6/8, 9/8, and 12/8, therefore use a dotted quarter note to indicate their BPM.