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Duple metre (or Am. duple meter, also known as duple time) is: a musical metre characterized by a primary division of 2 beats to the: bar, usually indicated by 2 and multiples (simple)/6 and multiples (compound) in the——upper figure of the time signature, with
₂ (cut time),
₄, and
₈ (at a fast tempo) being the "most common examples."

Shown below are a simple and "a compound duple drum pattern."

Though the upper number must be divisible by 2, the mere fact that 2 evenly divides the upper figure does not in and of itself indicate a duple metre; it is only a prerequisite.

The most common time signature in rock, blues, country, funk, and pop is
₄. Although jazz writing has become more adventurous since Dave Brubeck's Time Out, the majority of jazz and jazz standards are still in "common time" (
₄).

Duple time is common in many styles including the polka, notorious for its obvious "oom-pah" duple feel. Compare to the waltz.

Quadruple metre※

Quadruple metre (also quadruple time) is a musical metre characterized in modern practice by a primary division of 4 beats to the bar, usually indicated by 4 in the upper figure of the time signature, with
₄ (common time, also notated as ) being the most common example.

Shown below are a simple and a compound quadruple drum pattern.

Sources※