Imperfect consonances

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(Mus.) chords like the third and sixth, whose ratios are less simple than those of the fifth and forth.

See also: Imperfect

References in periodicals archive ?
The study explained that the bird also favored to sing perfect consonances (octaves, perfect fifths, and perfect fourths) over imperfect consonances leading to some passages which may sound to human listeners as if they are structured around a tonal center.