七しち音おん音おん階かい

noun

heptatonic scale; seven-note scale

Music theory term for any scale with seven notes per octave, such as the major or natural minor scale.

• 西せい洋よう音おん楽がくの長ちょう調ちょうや短たん調ちょうは七しち音おん音おん階かいに基もとづいている。

  Western major and minor scales are based on the heptatonic scale.