When I was in college a few hundred years ago some buddies picked up tickets for Neil Young, and got one for me without asking. I didn't want to go, as I thought he was more country sounding than rock. I got talked into going. One of the best concerts I've ever been to! Went again when he came back through Minneapolis another time, same experience. He had some amazing jams.
Worst concert of all time was the Grateful Dead and Bob Dylan at the Metrodome. The sound was horrendous. The show may have been good, but the dome was a crap place for a concert.
Sorry for the interruption.