Harmonic seventh chord
A major triad plus the harmonic seventh interval / From Wikipedia, the free encyclopedia
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The harmonic seventh chord is a major triad plus the harmonic seventh interval (ratio of 7:4, about 968.826 cents[1]). This interval is somewhat narrower (about 48.77 cents flatter, a septimal quarter tone) and is "sweeter in quality" than an "ordinary"[2] minor seventh, which has a just intonation ratio of 9:5[3] (1017.596 cents), or an equal-temperament ratio of 1000 cents (25⁄6:1).