I go to shows of all genres, but here are just some of the metal bands I've seen live so far:
Abysmal Dawn, Acid Witch, Aleister Cowboy, Allegaeon, Amarok, Amon Amarth, Armored Saint, Blood Incantation (x3), Bewitcher, Blood Star, Cattle Decapitation (x2, 1st at the world premiere of Death Atlas :) ), Carcass, Carnifex, Cannibal Corpse (x4), Castrator, Cronos Compulsion, Cryptopsy (x2), Claustrofobia (x3), Conan, Darkest Hour, Deathgrave, Death to All, Decapitated, Decrepit Birth, Devourment, Early Moods, Enforced (x2), Exciter, Exhumed, Exmortus, Extermination Dismemberment, The Faceless, Fulci, Full of Hell, Frozen Soul (x3), Gates To Hell, Ghoul, Ghost Bath, GODFLESH, Gorguts, Harvested, Haunt, HAGGUS, Harakiri for the Sky, Hell, I Am Morbid, Immolation (x2), Incantation, Ingested, Inoculation, Katagory V, Krisiun, Knoll, Left to Die, Masacre, Mayhem, Meshuggah, Midnight (x2), Mizmor, Morbikon, Mortal Wound, Mortiferum (x2), Mortuous (x2), Mutilation Barbecue, Necrofier, Necrot, Nekrogoblikon, Night Demon, Nunslaughter, Obituary (x4), Oryx, Ossuary, Phobophilic (x3), Possessed, Prong, Sanguisugabogg (x2), Savage Master, Savage Oath (at their first live performance!), Sepultura, Spectral Voice, Skeletal Remains (x3), Street Tombs, Suffocation, Summoning the Lich, Sunn O))), Swallow the Sun, Tribal Gaze, Truce in Blood, Uada, Undeath (x2), Unto Others, Vader, Vektor, Venom, Inc., Vermin Womb, Visigoth, Voivod, Vomit Forth, Warbringer, W.A.S.P., Witch Vomit (x2), Wormwitch, Yaotl Mictlan, 200 Stab Wounds
Also seen a FUCKTON of local bands too but I was just mentioning the big ones!
Don't know if they count:
Motley Crue and Poison (if you consider hair metal lmao)
Mortiis + a few other dungeon synth-ers
UPCOMING:
Napalm Death, Melvins, EYEHATEGOD, God's Iron Tooth, Truckfighters, Vulvodynia, The Last Ten Seconds of Life, Organectomy, Wormhole, Inferi, Vitriol, Greylotus, Demon King