Text: ratio a relationship, or interval, expressing the vibrations per second, or cycles, of the two tones concerned, generally in the lowest possible [integer] terms;...simultaneously a representative of a tone and an implicit relationship to a "keynote" -- or unity. Euclid's definition: a mutual relation of two magnitudes of the same kind to one another in respect of quantity. [from Partch 1974, Genesis of a Music, 2nd ed., Da Capo Press, New York, p. 73]

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