I really hate these threads cause then everyone brings up NON-metal bands like Disturbed, Mastodon, Lamb of God, Trivium, etc.
Ok let me recommend you some good REAL metal:
Thrash metal: Kreator, Destruction, Megadeth, Overkill, Sepultura (before Chaos AD), Iced Earth.
Black Metal: Bathory (first 4 albums), Mayhem, Burzum, Gorgoroth, Old Man's Child(not the new album though).
Death Metal: Death, Hypocrisy (first couple albums), Cryptopsy, Autopsy.
Melodic Death Metal: Dark Tranquillity, In Flames (before 2002), At The Gates, Arch Enemy(first 3 albums), Carcass (Heartwork album only), Insomnium, Children of Bodom(first 3 only), Kalmah.
Power Metal: Helloween, Stratovarius, Firewind, Iron Mask, Magic Kingdom, Warmen.
Folk/Viking Metal: Bathory (after Blood Fire Death), Ensiferum, Manegarm, Equilibrium, Finntroll, Eluviete, Korpiklanii, Wintersun (actually a combination of this and previous two).
Misc metal: Nevermore, Opeth, Dream Theatre, Queensryche, Atheist.
Ok let me recommend you some good REAL metal:
Thrash metal: Kreator, Destruction, Megadeth, Overkill, Sepultura (before Chaos AD), Iced Earth.
Black Metal: Bathory (first 4 albums), Mayhem, Burzum, Gorgoroth, Old Man's Child(not the new album though).
Death Metal: Death, Hypocrisy (first couple albums), Cryptopsy, Autopsy.
Melodic Death Metal: Dark Tranquillity, In Flames (before 2002), At The Gates, Arch Enemy(first 3 albums), Carcass (Heartwork album only), Insomnium, Children of Bodom(first 3 only), Kalmah.
Power Metal: Helloween, Stratovarius, Firewind, Iron Mask, Magic Kingdom, Warmen.
Folk/Viking Metal: Bathory (after Blood Fire Death), Ensiferum, Manegarm, Equilibrium, Finntroll, Eluviete, Korpiklanii, Wintersun (actually a combination of this and previous two).
Misc metal: Nevermore, Opeth, Dream Theatre, Queensryche, Atheist.