Musical Grammars as the Basis of Non-Speech Audio Communication

The Overtone Series

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

Note:
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.