Assertion: complement | /r/ObjectUse | used in musical set theory
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text: In musical set theory or atonal theory, complement is used in both the sense above (in which the perfect fourth is the complement of the perfect fifth, 5+7=12), and in the additive inverse sense of the same melodic interval in the opposite direction – e.g. a falling 5th is the complement of a rising 5th.[citation needed]