Odd time (or complex time, or irregular time) refers to any rhythm where the number of beats to the measure can't be divided neatly into twos or threes. So 5/4, 7/4, 11/4 and 13/4 are all examples of odd time.

9/8 is compound time like 6/8 since it divides neatly into threes. Also 3/4 is called simple time like 2/4 and 4/4. So - the musical idea is not quite the same concept as odd numbers in mathematics.

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