Toss up between Rage Against the Machine about three years ago in New Orleans for Voodoo Fest and The Roots in D.C. about six years ago. They were both awesome for completely different reasons. Rage I was really excited for because they had just reformed. The Roots, well, I had no fucking idea who they were and I went to this thing to see Jane's Addiction (who sucked balls live) and they stole the show.
Edit: Oh, and maybe NIN, but only because the light show was insane. That was Voodoo Fest again, two years ago, I think?
Edit: Oh, and maybe NIN, but only because the light show was insane. That was Voodoo Fest again, two years ago, I think?