Heptatonic scale
Musical scale with seven pitches / From Wikipedia, the free encyclopedia
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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 A
- the melodic minor scale, A B C D E F♯G♯A ascending, A G F E D C B A descending
- the harmonic minor scale, A B C D E F G♯A
- the harmonic major scale, C D E F G A♭B C.
Indian classical theory postulates seventy-two seven-tone scale types, collectively called melakarta or thaat, whereas others postulate twelve or ten (depending on the theorist) seven-tone scale types.
Several heptatonic scales in Western, Roman, Spanish, Hungarian, and Greek music can be analyzed as juxtapositions of tetrachords.[1] All heptatonic scales have all intervals present in their interval vector analysis,[2] and thus all heptatonic scales are both hemitonic and tritonic. There is a special affinity for heptatonic scales in the Western key signature system.