The Overtone Series
Tones whose pitch ratios form simple fractions make up the overtone series. For example, starting with C:

Note C c g c' e' g'
Freq/Hz 32.7 65.4 98.1 130.8 163.5 196.2
Ratio 1:1 1:2 1:3 1:4 1:5 1:6

Western music has standardised on the use of the tempered scale (where the size of a semitone is constant).

As a result, tones further along the overtone series are slightly higher or lower in pitch than the commonly used note of the tempered scale.

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