2. Consonance (harmony) = ìsimpleî number ratios
frequency ratio between tones
relative dissonance
between pure tones
1 1.12 fourth fifth octave
where do names of
intervals come from?
e.g. 2:1 ("octave");
3:2 ("fifthî)
5/4 ("major thirdî)
Physical basis (conjecture): no beats between overtones
(overtones either agree exactly or not at all).
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