My favorite was the Tragically Hip whom I saw at the Roseland Theater in Portand , Oregon. I think that was 97. A smallish venue with maybe a 500 person capacity. I also saw them last summer at the Filmore and they were just as good. My other favorite music show is the Warped Tour. Have seen lots of great bands(and lots of mediocre to bad bands as well) there but usually the sets are 45 mins long so can't really qualify as a concert I guess. Sometimes it seems like the bands are just getting warmed up and they have to get off.
I think one of the best Warped events I have been to had Rancid, Anti Flag, Bad Religion, Yellowcard, Less Than Jake. Fantastic show about 4 years ago in SF