Your First Concert was.....

Allman Brothers either at the Georgia Tech Collesium or the Atlanta Civic Center 1970. I saw them at both that year.
They were always playing in Piedmont Park, which is where I first saw them, but I am not sure that qualifies as a concert or just a gathering of Hippies :-)

I saw Focus as well. They played Hocus Pocus and variations of it the whole show. It was still fun. I saw the Allman Bros just when Duane died but Berry was still alive. They did not cancel the tour.

Joe Walsh and James Gang for openers, followed by REO Speedwagon.

Jackson Browne on his "Running on Empty" tour at the great outdoor Blossom Music Center in Ohio. I played that album hundreds of times before I went and I'll never forget the sound of the first note of that live music, magical. Thanks for taking me back. I still have the LP.

Bo Diddley in Lubbock, Texas, probably 1959 or 1960. Quite an experience for a 14-year-old white kid from West Texas.