Major seventh, the larger of two commonly occurring musical intervals that span seven diatonic scale degrees
Minor seventh, the smaller of two commonly occurring musical intervals that span seven diatonic scale degrees
Harmonic seventh, the interval of exactly 4:7, whose approximation to the minor seventh in equal temperament explains the "sweetness" of the dominant seventh chord in a major key
Leading-tone or subtonic, the seventh degree and the chord built on the seventh degree
Seventh chord, a chord consisting of a triad plus a note forming an interval of a seventh above the chord root
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