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 - so though the number of beats is odd in the mathematical sense of the word, it's not normally called odd time in music. Also 3/4 is called simple time like 2/4 and 4/4.

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Play these rhythms and animations at any tempo with Bounce Metronome

You can use Bounce Metronome Basic or Bounce Metronome Pro to practise these and many more odd time signature rhythms at any tempo, including changing tempo.