“The most likely reason for the adoption of a relatively small number of discrete intervals as the tonal material for music is that discretization or categorization is a typical, if not universal, strategy used by animals in order to reduce information overload and facilitate processing when subjected to the high-information-conetent signals and/or high information rates from a highly developed sensory system (e. g., Estes, 1972; Terhardt, 1991). An obvious example is the processing of speech information by humans, wherein each language selects a relatively small portion of the available timbral-differences that can be produced by the vocal tract as information-carrying units (phonemes) in the language. A related reason for discrete scales, and another obvious analogy with speech perception, lies in the social aspect of music. Music first developed as, and still largely remains, a social phenomenon associated with religious or other rituals that, like language, necessitated an easily remembered common framework.”

Burns, Edward M. (1999). "Intervals, Scales, and Tuning", 'The Psychology of Music second edition, p. 218. Deutsch, Diana, ed. San Diego: Academic Press. ISBN 0122135644