I was able to see them once, at this show:
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http://www.ledzeppelin.com/node/568/686
My buddy Jack Price had a Corvair, we drove down from Jacksonville. For some reason it would only engage 4th gear after the concert.
They played Black Dog, Stairway to Heaven, and Going to California from the fourth album, which hadn't been released yet, so that was interesting/confusing.
The whole night was interesting/confusing. It
was 1971, after all...