In these pages it is explained for what physical (but musical also) reason in the western civilization certain scales, among the so many possible combinations, have been used; because, for example, an octave is just divided in twelve semitones.
Calls of mathematics
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HARMONY
ACOUSTICS
Calls of physics
The static waves
The sound
Mathematical examination
The succession of harmonic sounds
The intervals of octave and fifth
Construction of pitagoric scale
Construction of natural scale
Consonances and dissonances
Intervals of second in natural scale
The problem of modulation
The tempered scale
Other types of tempered scales