Metal / Speed Metal

as i lay dying ( < amazing as fuck)
bullet for my valentine
five finger death punch ( < amazing as fuck)
August Burns red ( only song i like is composure)
In flames
Slipknot

In no specific order btw. All these bands rape the shit out of anything..

 

Dimmu Borgir
Cradle of Filth
Amon Amarth
Slipknot
Lamb of god
As I Lay Dying

/thread

 

Lamb of God
Devildriver
Behemoth
Dimmu Borgir
Carpathian Forest
Unearth
As I Lay Dying
Bring Me The Horizon (more screamo/metalcore, but classed as metal anyways...)
As Blood Runs Black
Arch Enemy (hot female singer, voice like a man lol)
All That Remains (fast paced and awesome)
All Shall Perish (listen to "We Hold These Truths")
Trivium (The new album rocks, as do the old ones)
Slipknot (GOING TO SEE THEM IN 8 DAYS... FUCK YEAH!)

many.. many more.

He's Right, they are NWOAHM (New Wave of American Heavy Metal, also known as metalcore)

Thrash Metal... Pfft...

Yeah Testament are awesome, I like the song "Henchman Ride"

Pretty sweet band.

Do your research =D...
http://en.wikipedia.org/wiki/New_Wave_of_American_Heavy_Metal