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In music a tuplet is a note value with a duration other than its usual, or, rather, a set of notes played not in the predominating meter, most often marked with a (near) horizontal bracket. The most common is the triplet. Tuplets produce irrational rhythms or may be used as polyrhythms when played against the regular duration. They are extrametric rhythmic units.
Three triplets can fill one beat to the same unit that 2 notes of the usual kind would. Examples:
Eighth note triplets: 3 of these make a quarter note; if the bottom number of a time signature is 4, this is one beat.
Quarter note triplets: 3 of these make a half note; if the botttom number of the time signature is 2, this is one beat.
Besides the triplet, some others include the quintuplet (5:4) and the septuplet (7:4).
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