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They have been well-known since Darwin's time, he attributing to them an esthetic value which has been denied by Wallace, Tylor, Lloyd Morgan, Wallaschek, and Groos.
"The human voice," Wallaschek<1> tells us, "equally admits of any pentatonic or heptatonic intervals, and very likely we should never have got regular scales if we had depended upon the ear and voice only. The first unique cause to settle the type of a regular scale is the instrument."
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