If you really want to go back in time, really back into the vault...
At the 13:30 mark is one of the early live versions of 2112, back in 1976. They were young and raw, but damn, they were good.
(And I'm biased, because 2112 is based on Ayn Rand's "Anthem")
http://www.youtube.com/watch?v=_VFG0PEIa8Y
