They are wind instruments blown by the mouth and tuned in what is called the Pentatonic scale, which sounds much as the scale of C Major would if F and B were omitted. [Please select]
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"The human voice," Wallaschek 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." [Please select]
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