Time Machine to any Concert

If you could go back in time to any one particular concert, which one would it be, and why? It could be one that you've already seen - but preferably one you missed because it was before your time, or you couldn't afford it, or didn't know any better at the time, etc.

For myself, I'm tempted to say the Beatles first tour of the U.S., just to experience the hype, but I think all the schoolgirl screaming would ruin it for me. I think maybe I'd opt for seeing Jimi Hendrix at the Monterey Pop Festival in 1967, before he really started to get an American following. Or maybe even a couple years earlier in Europe, when he was developing a following amongst many of the early British rock stars. One of his first performances on stage was an impromptu jam session with Eric Clapton and Cream. I'd pay top dollar just to see the looks he probably got from the audience who no doubt had never heard anything like it.

Besides those, I would love to see early, pre-fame performances by some of my other favorite artists, like Van Morrison, Muddy Waters, Buddy Guy, or Neil Young.