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Type of musical chord From Wikipedia, the free encyclopedia
In music, a minor seventh chord is a seventh chord composed of a root note, a minor third, a perfect fifth, and a minor seventh (1, ♭3, 5, ♭7). In other words, one could think of it as a minor triad with a minor seventh attached to it.[2]
Component intervals from root | |
---|---|
minor seventh | |
perfect fifth | |
minor third | |
root | |
Tuning | |
10:12:15:18[1] | |
Forte no. / | |
4-26 / |
For example, the minor seventh chord built on A, commonly written as A−7, has pitches A-C-E-G:
A seventh chord with a minor third, perfect fifth, and minor seventh is commonly called a minor seventh chord, but also sometimes a minor/minor seventh chord to distinguish it from the minor/major seventh chord discussed below. It can be represented as either as m7 or −7, or in integer notation, {0, 3, 7, 10}.
This chord occurs on different scale degrees in different diatonic scales:
Example of tonic minor seventh chords include LaBelle's "Lady Marmalade", Roberta Flack's "Killing Me Softly with His Song", The Doobie Brothers' "Long Train Runnin'", Chic's "Le Freak", Lipps Inc.'s "Funkytown", and the Eagles' "One Of These Nights".[5]
The major sixth chord (major triad with an added major sixth) is an inversion of this chord.
When the seventh note is a major seventh above the root, it is called a minor/major seventh chord. For example, the minor/major seventh chord built on C, commonly written as CmM7, has pitches C–E♭–G–B:
Its harmonic function is similar to that of a "normal" minor seventh, as is the minor seven flat five or half-diminished chord – but in each case, the altered tone (seventh or fifth, respectively) creates a different feeling which is exploited in modulations and to use leading-tones.
The minor seventh chord may also have its interval of minor seventh (between root and seventh degree, i.e.: C–B♭ in C–E♭–G–B♭) rewritten as an augmented sixth C–E♭–G–A♯.[6] Rearranging and transposing, this gives A♭–C♭–E♭–F♯, a virtual minor version of the German augmented sixth chord.[7] Again like the typical augmented sixth, this enharmonic interpretation gives on a resolution irregular for the minor seventh but normal for the augmented sixth chord, where the 2 voices at the enharmonic major second converge to unison or diverge to octave.[8]
The just minor seventh chord is tuned in the ratios 10:12:15:18.[9] This may be found on iii, vi, and vii.[10] Another tuning may be in the ratios 48:40:32:27.[11]
In standard tuning, the left is the low E string, the number is the fret, and x means mute the string.
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