There are few that come to mind -
Honestly, I've always felt that Tom Morello is just a riff machine. Rage Against The Machine's back catalog is stocked full of songs that would be other bands number 1 hits. And Audioslave was incredible, "Cochise" is still one of my favourite songs of all time... just so much balls to that riff.
hmmm.... I gotta say hendrix or ZZ top.....