FamousHendrix ChordPurple Haze, 1967 · Jimi Hendrix (The Jimi Hendrix Experience)
The verses: after the tritone intro riff, the verse chords are E7♯9, G and A, with E7♯9 as the home chord.
A dominant seventh chord with a sharp ninth on top, so a major third and a minor-sounding third are heard at once. That clash gives it a gritty, bluesy bite. Jimi Hendrix made it famous as the home chord of the verses of Purple Haze in 1967.
Also called Purple Haze chord, Gretty chord, Hold It chord, Gretty chord (the Beatles' name for it), Hold It chord (Johnny Winter, John Scofield), dominant seventh sharp ninth
Sources: Dominant seventh sharp ninth chord (Wikipedia) · Purple Haze (Wikipedia) · Purple Haze Guitar Lesson (Jon MacLennan) · Michelle (song) (Wikipedia)