Everclear, KoRn, Deftones, Third Eye Blind, Papa Roach, 3 Doors Down, Blessid Union of Souls, The Kingsmen, Spin Doctors, Staind
Wheatus, The Offspring, The Vandals, Beck, The Eurythmics, No Doubt, Alanis Morissette, Matchbox 20, Lifehouse, Fastball, Collective Soul, Incubus, Linkin Park, System of a Down, Blink 182, Disturbed, Trust Company, Powerman 5000
.... I'm sure I forgot some, but that's the majority of them & I've seen a few of them more than once (Everclear, KoRn, Matchbox 20, Staind, & Incubus). And hopefully I'll be going to Ozzfest this year and I'll be able to add some more bands to my list