Bands that you've seen live

OK, you'll see how old I am, but the strangest concert I ever saw was at the Altoona, PA racetrack (horses). An unknown band by the name of ZZ Top was the first warm up band. Everyone in the crowd was looking at each other as if to say, "Are we really high, or are these farmer-looking guys from Texas rocking our faces off?" Second warm up band was another unknown by the name of Earth, Wind and Fire. Same stunned crowd reaction. The headliners: Uriah Heep. Meh. People started leaving about half way through their set. Totally out-played.