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In 6/8 time, there are 2 beats per measure, and one dotted quarter note has one beat. In 9/8 time, there are 3 beats per measure, and one dotted quarter note has one beat. In 12/8 time, there are 4 beats per measure and one dotted quarter note has one beat. In 6/16 time, there are 2 beats per measure and one dotted eighth note has one beat. Etc. Another way to extend the duration of a note is by using the tie.
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 120 quarter notes (or crotchets).or example, a tempo of 60 beats per minute signifies one beat per second, while a tempo of 120 beats per minute is twice as rapid, signifying one beat every 0.5 seconds.