Augmented seventh chord
| Component intervals from root | |
|---|---|
| minor seventh | |
| augmented fifth | |
| major third | |
| root | |
| Tuning | |
| 80:100:125:144 | |
| Forte no. / | |
| 4-24 / |
The augmented seventh chord, or seventh augmented fifth chord,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♭:
The chord can be represented by the integer notation {0, 4, 8, 10}.
Use
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
Hendrix chord", a 7♯9 chord which contains the interval of an augmented ninth but not an augmented fifth.[5]
