Augmented seventh chord
Musical chord From Wikipedia, the free encyclopedia
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♭:
| Component intervals from root | |
|---|---|
| minor seventh | |
| augmented fifth | |
| major third | |
| root | |
| Tuning | |
| 80:100:125:144 | |
| Forte no. / | |
| 4-24 / |
The chord can be represented by the integer notation {0, 4, 8, 10}.
Use
Summarize
Perspective
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]
Augmented seventh chord table
| Chord | Root | Major third | Augmented fifth | Minor seventh |
|---|---|---|---|---|
| Caug7 | C | E | G♯ | B♭ |
| C♯aug7 | C♯ | E♯ (F) | G (A) |
B |
| D♭aug7 | D♭ | F | A | C♭ (B) |
| Daug7 | D | F♯ | A♯ | C |
| D♯aug7 | D♯ | F (G) |
A (B) |
C♯ |
| E♭aug7 | E♭ | G | B | D♭ |
| Eaug7 | E | G♯ | B♯ (C) | D |
| Faug7 | F | A | C♯ | E♭ |
| F♯aug7 | F♯ | A♯ | C (D) |
E |
| G♭aug7 | G♭ | B♭ | D | F♭ (E) |
| Gaug7 | G | B | D♯ | F |
| G♯aug7 | G♯ | B♯ (C) | D (E) |
F♯ |
| A♭aug7 | A♭ | C | E | G♭ |
| Aaug7 | A | C♯ | E♯ (F) | G |
| A♯aug7 | A♯ | C (D) |
E (F♯) |
G♯ |
| B♭aug7 | B♭ | D | F♯ | A♭ |
| Baug7 | B | D♯ | F (G) |
A |
See also
References
Bibliography
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