The Edgar Winter classic. Love the studio version, but never seen a live version before, and stumbled across this doozy. Just stoner rock at its finest. But most scumbags of my generation are more familiar with the Phish version of this tune. Surprisingly, Phish's rendition sounds restrained compared to Edgar's, though they do turn the psychedelia up to 11 towards the end of the tune.
Also, Mean Mr. Mustard.