Text: The subdominant, or lowest chord in the key - F, A, C, is the natural product of the first combination of the three primary ratios (2, 3, 5). Their second combination developes the tonic or middle chord C, E, G. The third combination develops the dominant or highest chord G, B, D. keynote or root of F F A C subdominant C E G Tonic G B D Dominant The Scientific Basis and Build of Music, Ramsay.

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