I'm just going to list the bands that you can look up, unless there are specific songs i like from them, most of them you might already know of but some might be new to you. The majority of these bands are death metal or black metal, I do not advise you listen to these if you are strongly religious, (the bands do not mock any religion but people have come to me and complained because of some of the lyrics and of course if you look at some of the names of the bands or song names you'll get my point). Most of these bands do have a parental advisory warning on all of their albums (Im sure you could care less) but im just letting you know.

Metallica
Pantera
Megadeth
Slayer
Lamb of God
Dethklok
Devildriver - Swinging the dead, Meet the Wretched
Warbringer - Total War, At the Crack of Doom
Evile
Municipal Waste - The Art of Partying, Sadistic Magician
Skeletonwitch - Beyond the Permafrost
Hate - Omega, Hex, Euphoria of the New Breed
Kronos - The Road of Salvation, Divine Vengeance
Ungodly - The Beast Within, Pestilence of the limbo
Toxic Holocaust - Wild Dogs, Future Shock, War is Hell, City of a Million Graves
Onslaught - Shock 'N' Awe