I saw the man play back around 1971 or 72.... great show. He had Rick Derringer with him on that tour on guitar with his band. Tix were about $3 IIRC and the other bands were a new group called Foghat and country rockers Poco.
Certainly worth the cost of the tix to get in. I have some of his stuff on vinyl. I might need to pull it out and spin it.... maybe even digitize it.