Jisho

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Noun
1. heptatonic scale; seven note scale; heptachordMusic
Wikipedia definition
2. Heptatonic scaleA heptatonic scale is a musical scale with seven pitches per octave. Among the most famous of these are the major scale, C D E F G A B C; the melodic minor scale, C D E♭ F G A B C ascending, C B♭ A♭ G F E♭ D C descending; the harmonic minor scale, C D E♭ F G A♭ B C; and a scale variously known as the Byzantine, Hungarian, gypsy, or Egyptian scale, C D E♭ F♯ G A♭ B C.
Read “Heptatonic scale” on English Wikipedia
Read “七音音階” on Japanese Wikipedia
Read “Heptatonic scale” on DBpedia

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