Text: Resultant tones produced by the combination of the ordinary harmonic intervals. The resultant tone is deeper than the lowest primary tone by: Interval Ratio Step Difference Octave 1:2 1 0 Fifth 2:3 1 an octave Fourth 3:4 1 a twelfth Major Third 4:5 1 two octaves Minor Third 5:6 1 2 octaves & a major third Major Sixth 3:5 2 a fifth Minor Sixth 5:8 3 major sixth

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