Harmonic seventh
Musical interval / From Wikipedia, the free encyclopedia
The harmonic seventh interval, also known as the septimal minor seventh,[2][3] or subminor seventh,[4][5][6] is one with an exact 7:4 ratio[7] (about 969 cents).[8] This is somewhat narrower than and is, "particularly sweet",[9] "sweeter in quality" than an "ordinary"[10] just minor seventh, which has an intonation ratio of 9:5[11] (about 1018 cents).
Quick Facts Inverse, Name ...
Inverse | Septimal major second |
---|---|
Name | |
Other names | septimal minor seventh, subminor seventh, acute diminished just seventh, quarter comma augmented sixth |
Abbreviation | m 7, H 7, min 7, accdim 7, Aug 6 |
Size | |
Semitones | ~9.7 |
Interval class | ~2.3 |
Just interval | 7:4[1] |
Cents | |
Just intonation | 968.826 |
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The harmonic seventh arises from the harmonic series as the interval between the fourth harmonic (second octave of the fundamental) and the seventh harmonic; in that octave, harmonics 4, 5, 6, and 7 constitute the four notes (in order) of a purely consonant major chord (root position) with an added minor seventh (or augmented sixth, depending on the tuning system used).