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Music Theory for Computer Musicians by Michael Hewitt

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Compound Time Signatures

There is a further group of metric cycles recognized in conventional musical theory. Duple, triple, and quadruple time are called simple time signatures. When each beat of a simple time signature is subdivided into three, the equivalent compound time signature is obtained. Compound duple time—in other words, 6/8—thus has six beats. Compound triple time (9/8) has nine beats, while compound quadruple time (12/8) has twelve beats. See Figures 7.8 through 7.10 for examples of each.

Figure 7.8. Compound duple time has six beats.

Figure 7.9. Compound triple time has nine beats.

Figure 7.10. Compound quadruple time ...

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