Chronological order.....
1980ish - Tie, Blue Oyster Cult/Also Nova or Ted Nugent/Donnie Iris (my first concerts ever, cant remember which one was first, they were within a few months of each other)
1982 or 1983 - Ramones, opening for Cheap Trick. Our band went to see The Ramones, and had our noses stuck up about Cheap Trick. We stayed, and fell in love with that band, too.
1983 or 1984 - Talking Heads. Simply awesome concert.
Late 1999 or early 2000 - Bruce Springsteen and The E Street Band. Right after they reformed and started touring again, after about 10 years apart. Amazing.
Last June - Ringo and his All Star Band.
Many honorable mentions, most notably seeing the opening show of The Big Money Tour for Rush in 1985. Despite being amazed and entranced by Mr. Peart, the show bored me, they played most of the new album which no one knew any of......ashamed to admit that, especially to the guys in my band who are HUGE Rush fans. And yes, I flipped out during the drum solo (and I usually don't really enjoy extended drum solos)....he started the solo on his acoustic kit and after a while of phenomenal playing, stood up as his riser started to turn, him playing all the while. As the electronic kit came around to the front, he seamlessly played from the one kit to the other, added a couple flourishes, and led it right into Tom Sawyer. Crazy memory. Made up for the rest of the (boring) show. Shameful, coming from a drummer, but I'll own it.