Best concert I was ever at, I shit you not, is Weird Al Yankovic. :thumbsup:

The rest in no particular order:

Yes
Deep Purple
Bloodrock
Grand Funk
Jon Luc Ponty
Buddy Rich
Journey (before Steve Perry)
Kansas
Doobie Brothers
Molly Hatchet
Johnny Winters
Renaissance
America
Lynyrd Skynyrd
Marshall Tucker
Gary Wright
Poco
Emerson Lake and Palmer
Jethro Tull (although I thought Ian Anderson sucked that night)

One of my greatest regrets is missing Pink Floyd in concert. Had a chance to go see them on the Animals tour and just didn't have the money.