The first concert I ever went to was Neil Diamond. I mean, I'm sure that my parents took me to some other concert before then that was geared towards small children, but... I like counting Neil Diamond more.
Especially since the last concert that I went to was Neil Diamond. He's the only one that I've seen multiple times, since my mother is a huge fan (from the very start of his career and even earlier when he wrote for the Monkees).
I've been to other various concerts through my life. I've seen: Paul Simon, Brian Wilson, Chicago, the Doobie Brothers, Journey, Lover Boy, and Youngstown. There is one artist that I really regret never seeing live, and that's Phil Collins. Absolutely love his music, and would have wanted to just feel that energy live.