I have a bootleg of
Zeppelin's Jan 10 69 Fillmore West concert. It's a white hot Zeppelin on tape. Absolutely explosive. My favorite part is at the beginning of How Many More Times where Plant introduces the band, and someone in the audience asks "who are you?"
A few years later, everyone will have known who is that golden god. And a few years after that, Zeppelin was a terrible live act.