Number one has to be my first: 1971, Olympia Stadium, Detroit, MI, 5th row: Alice Cooper and Steppenwolf. When Steppenwolf played "Pusher", with that awesome Hammond B3, and the searing, ear-splitting lead guitar, my life changed. I went from being a stupid teenage boy, to a stupid teenage boy with an obsession: loud, raunchy, fuzzy, BLUESY, funky, rock-and-roll. By 50 years of age my musical taste has broadened, but not I've not given up pursuit of listening to that kind of music, much to the dismay of my beautiful wife.
Others: J. Geils Band and Uriah Heep at some hockey rink (on the floor - no ice - no seats).
Iggy Pop at some hockey rink in Windsor, Ontario. Silver glitter G-string, spitting on the crowd, two members of the band started brawling with each other in the middle of a song! A good time was had by all.
Johnny Winter at Cobo Hall - the crowd got so rowdy (fights, flying beer bottles) they turned the house lights on and some guy got on stage, threatening to cancel the show. But Johnny told him to get the **** off the stage and kept on rockin' anyway.
Aerosmith and Ted Nugent at the Silverdome in Pontiac, MI. I think it was just newly built, so Perry and the Nuge tried to rock it down. It didn't fall, but had to incur significant structural damage from what I remember.
God, and I can still hear? Huh? What?