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After twelve equal multiplicative increases we reach the octave (twice the pitch).

All the other notes (except Ab) tend to line up harmonically as well.

Twelth root of two is the ratio between semi-tones.

Twelth root of two is 1.0594631 (i.e. six percent).

Unpleasant to westernised musical ears if ten cents (ten hundredths of a semitone) out of tune!