An augmented seventh is a type of chord that consists of a root note, a major third, an augmented fifth, and a minor seventh. This chord is often used in music to create tension and a sense of resolution when it resolves to a different chord. It is commonly notated as "7♯5" or "aug7." In the context of music theory, the augmented seventh can be found in various genres, including jazz and classical music. It is particularly effective in leading to dominant chords, enhancing the harmonic progression. Understanding this chord can enrich a musician's ability to compose and improvise.