Can I point out, it's Machine Head, not Machinehead.

Can I add:

Amon Amarth - Viking-themed melodic death metal
Anal C**t - Grindcore
Anthrax - Thrash Metal
At the Gates - Melodic Death Metal
August Burns Red - Metalcore

Behemoth - Death Metal
Bleeding Through - Metalcore
Bring Me The Horizon - Deathcore
Brutal Truth - Deathgrind

Cannibal Corpse - Death Metal
Carcass - Death Metal/Grindcore
Chimaira - Heavy Metal
Converge - Metalcore/Extreme Metal
Cradle of Filth - Black Metal

Dark Tranquility - Melodic Death Metal
Death - Melodic Death Metal
Deathstars - Industrial Metal
Defleshed - Death/Thrash Metal
Deicide - Death Metal
DevilDriver - Melodic Death Metal/Groove Metal
Dimmu Borgir - Melodic Black Metal
Dry Kill Logic - Nu Metal/Metalcore
Dying Fetus - Death Metal

Evanescence - Alternative Metal

Fear Factory - Death/Thrash Metal

Genesis - Rock
God Dethroned - Melodic Death Metal

Hate Eternal - Death Metal
Hatebreed - Metalcore
Haunted, The - Thrash/Melodic Death Metal

In Flames - Melodic Death Metal

Job For A Cowboy - Deathcore/Death Metal

Madness - Pop/ska

Marilyn Manson - Alternative Metal (Bands only, so check him out on Wikipedia, says BAND!)
Mindless Self Indulgence - Industrial Rock
Misfits - Punk Rock
Mushroomhead - Alternative Heavy Metal

Napalm Death - Grindcore/Death Metal
Nickelback - Post Grunge
Nile - Brutal Death Metal

Opeth - Progressive Death Metal

Rasmus, The - Rock

Sepultura - Heavy Metal
Shadows Fall - Heavy Metal
Suicide Silence - Deathcore

Within Temptation - Rock


Bit of a list there Just went through my music collection and added ones I thought should be on the list, lol. Sorry to be annoying, lol! Also, all genres have been taken from Wikipedia!