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9For between two intervals, either in a melody sung by a voice, or played on a stringed instrument, neither with the third, sixth nor seventh can there be consonances, but only, as above shewn, with the diatessarôn and diapente up to the diapasôn do natural consonances arise, and those are produced by an union of those sounds which the Greeks call φθόγγοι (phthongi).
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