Purple Haze - Jimi Hendrix Experience
Easily one of the greatest guitar riffs of all time, maybe even THE greatest!!
Really good fun to play and I think I got this pretty accurate, there's lots of ropey ones around.
Note - the very intro it's often said (and seen in the TAB book) that there is a second note played with the higher octave, but after a lot of listens I'm convinced that it's the bass - but hey maybe it's there... add it in if you want?