In music, the dominant 79 chord ("dominant seven sharp nine" or "dominant seven sharp ninth") is a chord built by combining a dominant seventh, which includes a major third above the root, with an augmented second, which is the same pitch, albeit given a different note name, as the minor third degree above the root. This chord is used in many forms of contemporary popular music, including jazz, funk, R&B, rock and pop. As a dominant chord in diatonic harmony, it most commonly functions as a turnaround chord, returning to the tonic. The chord is also sometimes colloquially known, among pop and rock guitarists, as the "Hendrix chord" or "Purple Haze chord", nicknamed for guitarist Jimi Hendrix, who showed a preference for the chord and did a great deal to popularize its use in mainstream rock music. When used by The Beatles it has been called the "Gretty chord" although this can refer to a distinct six-string version. Spelling and notation There are two main ways to spell the chord, depending on the musical style, kind of musical notation (score or chord symbols), and personal taste. One consists of a dominant seventh chord with an added minor third placed one or more octaves over the major third (a minor tenth); the other, more common, consists of a dominant seventh chord with an added augmented ninth. The former can be written in popular chord symbol notation systems as 710 and the latter as 79. 7b10 is unorthodox way to write but it is in use on some contexts. Sometimes, in publications which include both scores and chord symbols, the score is notated with a both natural and flattened third, while the chord symbol has the sharpened ninth. Other more uncommon notations and names include major/minor or 7 (add min 3). Kenn Stephenson says that in rock music the sharp ninth spelling is much more prevalent than the split third version. Nature of the chord The 79 is an altered chord, and it is one option when seeing the chord symbol 7alt. It is functionally a dominant chord and thus "wants" to resolve to the tonic in diatonic harmony. Stuart Isacoff has called the chord "funky" or "bluesy" because of the tension "generated between the major third and the augmented ninth"; while Doug Munro deems it "jazzy" rather than bluesy. Eric Starr says, "the sharp nine tends to be edgier, bluesier, and