Originally Posted by Buzzov*en

Crust Punk wise : Dystopia (they can be considered Sludge as well), From Ashes Rise, His Hero Is Gone, Aus-Rotten, Caustic Christ, Behind Enemy Lines, Tragedy, Skitsytem, Doom etc.

Hardcore Punk : Black Flag, Circle Jerks, Negative Approach, Reagan Youth, Bad Brains, Ceremony, Trash Talk, Discharge, Hellmouth, Germs, Good Riddance, Dead Kennedys, The Adolescents, Dr. Know, Rich Kids On LSD, DRI, MDC, The ****s, Big Boys, and a ton of others.

Alternative: Nirvana, Dinosaur Jr, Paw, Mad Season, Sonic Youth, Alice In Chains, Soundgarden, Mudhoney, Screaming Trees, Deftones, REM, Smashing Pumpkins.

Metal (thrash, death, black, progressive, doom, stoner, grind) : Mastodon, Slayer, Sepultura, Pantera, Exhorder, Megadeth, Metallica, Lamb Of God, Black Tusk, Kylesa, Baroness, Down, The Sword, Electric Wizard, Kyuss, Municipal Waste, Warbringer, Merciless Death, Toxic Holocaust, Exodus, Testament, Overkill, Isis, Neurosis, Kreator, Pig Destroyer, Morbid Angel, Morbid Saint, Death, Nile (I'll stop there.)

Folk/Country/ Blues: Tallest Man On Earth, William Elliot Whitmore, Bob Dylan, Hank Williams, Hank Williams Jr, Hank III, Scott H Biram, Woody Guthrie, T-Bpne Walker, Hendrix, Brian Kahanek, Richard Thompson, SRV, Levon Helm, Brad Paisley, CCR, Johnny Cash (stopping there.)

Tom Waits where ever you want to fit him.