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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.
This is why Classical antiquity and the Middle Ages ranked the fifth among the perfect consonances, and considered thirds as imperfect" (ibid.
Causa pulchritudinis provides melodic justification for chromatic alteration in the progression from imperfect to perfect consonances.