RealMusicTheory

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Compound Meter and Time Signatures

In compound meter, each beat divides naturally into three equal parts rather than two. The underlying pulse feels the same as in simple meter, but each beat has a built-in triplet subdivision. Common compound meters are compound duple (2 beats, each divided into 3), compound triple (3 beats), and compound quadruple (4 beats).

Compound time signatures look like simple ones but require different interpretation. The top number gives the number of divisions (not beats): 6 means two beats each divided into 3, 9 means three beats each divided into 3, and 12 means four beats each divided into 3. The bottom number names the division note value: in 6/8, the eighth note is the division, so the beat is a dotted quarter. To find the beat count, divide the top number by 3.

The feel of compound meter is distinctly lilting or rolling compared to simple meter. Compound duple (6/8) is the meter of jigs, barcarolles, and many folk songs. The characteristic pattern is: one subdivision group of three followed by a second group of three, creating a long-short, long-short sway at the beat level. Distinguishing simple from compound meter by ear — does the beat subdivide in twos or threes? — is a key listening skill.

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