by J. D. Blackfoot
One of my all time favourites - arguably the best long rock song ever.
(certainly up there with Inagaddadavida by Iron Butterfly and Going Home by Ten Years After - but I think much better than those)
I think records sell in the hundreds of dollars for this, but it may be available on CD by now. (Side two was crap)
I doubt it's listenable online anywhere, but if anyone knows, I'd be interested as a reference.