(t) and two semi-tones (s), also called whole-steps and half-steps, but without two semi-tones in succession. Throughout history and to the present day, some have occurred much more commonly than others, namely Ionian (also called the major scale), Aeolian (also called the natural minor scale), melodic ascending minor, Dorian, Mixolydian, Lydian, Lydian dominant, Aeolian dominant, and altered scales.

Heptatonia prima

In these scales the semi-tones are maximally separated. They are known most

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