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[[File:4ado scale.wav|thumb]]
[[File:4ado scale.wav|thumb]]
'''4ado''' is the [[ADO|arithmetic equal division of the octave]] into four parts of 1/4 each. 4ado is perhaps the smallest ADO that contains useful intervals for harmony, containing athemajor third, perfect fifth, and harmonic seventh.
'''4ado''' is the [[ADO|arithmetic equal division of the octave]] into four parts of 1/4 each. 4ado is perhaps the smallest ADO that contains useful intervals for harmony, containing the major third, perfect fifth, and harmonic seventh.


== Intervals ==
== Intervals ==