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Augmented seventh chord
Musical chord From Wikipedia, the free encyclopedia
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The augmented seventh chord, or seventh augmented fifth chord,[1] or seventh sharp five chord is a seventh chord composed of a root, major third, augmented fifth, and minor seventh (1, 3, ♯5, ♭7).[2] It can be viewed as an augmented triad with a minor seventh.[3] When using popular-music symbols, it is denoted by +7, aug7,[2] or 7♯5. For example, the augmented seventh chord built on A♭, written as A♭+7, has pitches A♭-C-E-G♭:
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The chord can be represented by the integer notation {0, 4, 8, 10}.
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The root is the only optional note in an augmented seventh chord, the fifth being required because it is raised.[4] This alteration is useful in the major mode because the raised 5th creates a leading tone to the 3rd of the tonic triad.[3] See also dominant.
In rock parlance, the term augmented seventh chord is sometimes confusingly and erroneously used to refer to the so-called "Hendrix chord", a 7♯9 chord which contains the interval of an augmented ninth but not an augmented fifth.[5]
The augmented minor seventh chord may be considered an altered dominant seventh and may use the whole tone scale, as may the dominant seventh flat five chord.[7] See chord-scale system.
The augmented seventh chord normally acts as a dominant, resolving to the chord a fifth below.[8] Thus, G aug7 resolves to a C major or minor chord, for example.
Overall, however, the augmented seventh chord is infrequently used, often with the raised fifth degree being the result of a chromatic passing tone.[9]
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Augmented seventh chord table
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