at least some of the millions I have witnessed over the years
Weezer, Metallica, Pearl Jam, Plankeye, All Star United, Sunna, Vast, Sunny Day Real Estate, Kool Keith, Foo Fighters, Spacehog, Red Hot Chili Peppers, Bleach, Silage (RIP), Parkway, Disciple, Grits, Out of Eden, DC Talk, Aerosmith, MegaDeth, Talk Show, Third Day, Jennifer Knapp, Jars of Clay, Rebecca St. James, The Waiting, Old Man Shattered, Korn, 311, Incubus, The Queers, The Offspring, Mighty Mighty Bosstones, Insane Clown Posse, Ween, They Might Be Giants, Wu Tang Clan, Old Dirty Bastard, GZA, Stone's Folly, Oh Ranger!, Five Iron Frenzy, Philmore, Soul Junk, Pillar, Earthsuit, Third Eye Blind, Eve 6, Local H, Fuel, The Superjesus, Stanford Prison Experiment, Garbage, Girls Vs. BoysRob Zombie, No Knife, Elliot, Hot Water Music, Scared of Chaka, Red Earth, The Shins, Modest Mouse, Black Heart Procession, Supertones, Gospel Gangstas, Project 86, Primus, P.O.D., Newsboys, The Insyderz, The W's, Luna Halo, Skillet, Johnny Q. Public, Eternal Decision, Extol, Ultimatum, SonicFlood, Beanbag, Goldfinger, Bloodhound Gang, MxPx, 22 Jacks, Raze, The Aquabats, Reliant K, Sixpence None The Richer, Dime Store Prophets, Black Eyed Sceva, Seven Day Jesus, Flight 180, The Who, Unamerican, Supergrass, Dwight Yoakam, Counting Crows, Live, Bettie Seveert, Reverend Horton Heat, Butthole Surfers, Toadies, Better Than Ezra, Supersuckers, Queens of the Stone Age, Ben Folds Five, Jude, L7, Fu Manchu, Mike Watt, Life of Agony, Machine Head, Monster Magnet, Fear Factory, Styx, Kottonmouth Kings, SR-71, Splendor, Kiss, Skid Row, Ted Nugent, Hippos, Puya, Type O Negative, Starsky, Weird Al Yankovich, You Were Spiraling, Mindshift...
Bands I have seen more than once are in BLUE
Local Bands are in GREEN
Bands that were so terrible they should be avoided at all costs are in RED!!!
(This is noted only for the health of you, the viewer... Some of these are bands I really  like, but they are flat out horrible on stage.)
Bands that are especially excellent in concert are noted in PURPLE
Some bands may have more than one notation... example: The Pixies, Morcheeba...