The augmented seventh chord, or seventh augmented fifth chord, or seventh sharp five chord is a seventh chord composed of a root, major third, augmented fifth, and minor seventh (1, 3, ♯5, ♭7). It can be viewed as an augmented triad with a minor seventh. When using popular-music symbols, it is denoted by +, aug, or . For example, the augmented seventh chord built on A♭, written as A♭+, has pitches A♭-C-E-G♭:
The chord can be represented by the integer notation {0, 4, 8, 10}.
Musicians use various kinds of chord names and symbols in different contexts to represent musical chords. In most genres of popular music, including jazz, pop, and rock, a chord name and its corresponding symbol typically indicate one or more of the following:
For instance, the name C augmented seventh, and the corresponding symbol C, or C, are both composed of parts 1 (letter 'C'), 2 ('aug' or '+'), and 3 (digit '7'). These indicate a chord formed by the notes C–E–G–B. The three parts of the symbol (C, aug, and ) refer to the root C, the augmented (fifth) interval from C to G♯, and the (minor) seventh interval from C to B♭.