Your First Concert was.....

David Bowie 1975 at the Olympia arena in Detroit

hmmm . Roger Waters - Pros and Cons of Hitchiking tour.
Not bad for a first show.

The first I remember was Elton John at Kent State University's Memorial Hall. May of 1972.
"Mad Men Across the Water" was the only album out and he played that plus a great deal of "Yellow Brick Road."
The only better concert I've ever seen was Pink Floyd (1973)same venue and they played more than one song, in surround sound, from an album we'd not heard. Some obscure album called "The Dark side of the Moon".

Led Zeppelin, 1970, Charlotte Coliseum. I was 14. They played most of first two albums. I was blown away and hooked ever since and have been pursuing live music - rock and jazz - for 40 years.

Went to see ELP in early 1970 and got to sit on the front speaker stack next to the band shell at the East Town Theater in Detroit.

Yes came out first and I had no Idea who they were; they blew me away. ELP followed and were tremendous. I Decided it couldn't have been that good so I went back the next night (same seats) it was better! I have spent a lot on money on concerts since then and to this day none have been better.