Existing research has shown that single-voice entries in polyphonic music are more easily perceived than single- voice exits. A study of 195 assorted musical works reveals a marked asymmetry between voice entries and exits. Specifically, voices tend to be added one at a time, while voice exits tend to occur several at a time. This practice is consistent with the hypothesis that voice entries and exits are perceptually important points in musical works and that composers avoid single- voice exits because they are less likely to be perceived.

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