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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. 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 C, written as C+, has pitches C–E–G♯–B♭:
The chord can be represented by the integer notation {0, 4, 8, 10}.
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