**Simple intervals** are not bigger than an octave while **compound
intervals ** are larger than an octave. Ninths, tenths, elevenths and thirteenth are examples of compound
intervals. Octaves, thirds, fifths are simple intervals.

Each compound interval is related to a simple interval. By subtracting 7 from the compound interval you get the related simple interval. For example 9 - 7 = 2, so a 9th is related to a 2nd. A compound interval has the same quality as the related simple interval. Several examples of compound intervals and the related simple interval:

See Reading Music in the Tutorials section.

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José Rodríguez Alvira.