In music, duple refers to duple meter. Duple was best known as a British manufacturer of coach and bus bodywork from 1919 until 1989 Music is an Art form in which the medium is Sound organized in Time. Meter or metre is a concept related to an underlying division of time characteristic of western music Duple is also a duration of 1½ the regular note value duration in compound and or triple meter. Triple metre (or triple meter, also known as triple time) is a musical metre characterized by a primary division of 3 beats to the bar usually An irrational rhythm, it may also be used as a polyrhythm when played against the regular duration. In Music, the term irrational rhythm refers both to a particular extension of the traditional Western notation system for musical timeand to all the various rhythmic effects
In relation to duple time triple meter rhythms would be triplets. In Music a tuplet is any consecutive group of notes with an individual value more or less than half as long as the next larger note value