I always cringe when that conversation comes around because my answer is Kansas. It was the Portland Civic Center in Portland, Maine during my first summer as a Junior Counselor at summer camp.
David Johansen* opened up in support of his post-New York Dolls / pre-Buster Poindexter record “Live It Up” which I remember specifically because he was awesome.
Kansas? All I really remember is that they played “Dust In The Wind”, performed to perfection here by the Muppets very own Beaker.
Like it when the Muppets do pop music? Here’s another one.
*Six Degrees of Separation from David Johansen: He is the distant cousin of FOT (friend of Tim) VA who happens to be the WOB (wife of Bob) who was the drummer in the legendary It Can’t Happen To Me (ICHTM) and is a sometime-commenter here at TMUOTF. I know. WTF?!