First concert: Journey, shortly before Escape was released and one of the early shows with Jonathan Caine. Billy Squier opened.
most memorable: Peter Gabriel, So Tour in Hamburg, Germany, 1987. He ended the encore with Biko and turned the mic to the audience before leaving the stage. The whole audience kept singing long after the music stopped, the lights came up and people were walking out of the arena. The singing continued down in the subway station and onto the train. Unbelievably powerful. Gabriel was still falling into the audience then during Lay Your Hands on Me and since I was dead center with about 5 people b/w me and the stage, he went right overhead, pulling on my hand to get himself further into the audience.
other greats: first Rush show (signals tour), Roger Waters The Wall in 2010, any David Lindley performance, The Musical Box (Genesis recreation band from Canada), California Guitar Trio, Oingo Boingo with The Tubes at my college, Springsteen at the LA Colliseum, Yes, Dire Straits, so many . . .
almost forgot: Santa Barbara Blues Festival in 1987/8; I got to meet John Lee Hooker and shake his hand.