Fantasy gigging

Matt and I were talking after a few beers on Friday night (just a few this time, mind you). We had Bob Marley on the stereo and the conversation got around to 'If you could travel back in time and see any singer/band playing live that it is no longer possible to see (for whatever reason), and still keep a sense of historical perspective, who would you go and see?'

Current contenders are Bob Marley and the Wailers (Matt - no surprises there) and The Doors, early Beatles, or Jeff Buckley (me).

Any other suggestions?