Heptatonic scale - Wikipedia
https://en.wikipedia.org/wiki/Heptatonic_scale
A heptatonic scale is a musical scale that has seven pitches, or tones, per octave. Examples include: the diatonic scale; e.g., in C major: C D E F G A B C—and in the relative minor, A minor, natural minor: A B C D E F G Athe melodic minor scale, A B C D E F♯G♯A ascending, A G F E D C B A descendingthe harmonic minor scale, A B C D E F G♯Athe harm… See more
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