Just heard Van Halen on the radio. This is a band that I never got to see in concert, which makes me sad. I would have also liked to see Guns N' Roses...
I did see Lenny Kravitz... but I wasn't that impressed. I really like his old stuff!
After high school (in the 80s) I worked at KMEL radio station in San Francisco and got to see lots of great concerts.
My biggest disappointment was never seeing Pink Floyd, but Roger Waters in concert was the next best thing, he was fantastic!