Here are a few examples of metal bands that I listen to, though some of them could be classified also as Stoner Rock, and others could be considered to be Goth.
Also, Korn and Slipnot are not metal.
Opeth, Bloodbath, Edge of Sanity, Isacaarum, Iced Earth, Gorgoroth, Katatonia, Satyricon, Saturnus, Novembers Doom, Genocide SS, Aborted, Aeternus, Cephalectomy, Timecode, The Gathering, Hypocrisy, At The Gates, Death, Pigsty, Anaal Nakrath, Amon Amarth, Bolt Thrower, Macabre, Burzum, Cannibal Corpse, Cephelectic Carnage, Dark Yuneral, Dark Tranquillity, Divine Empire, Dissection, Einherger, Emperor, Enslaved, Entombed, Exodus, Forbidden, Gardanian, Goatwhore, Abigor, Malevolent Creation, Mardux, Lord Belial, Kataklysm, Lake of Tears, Summoning, Symphony X, Shadows Fall, Slowhorse, Warhorse, Tristania, Twin Obscenity, Overkill, Windir, Testament, Deadspeak, Polymorph, Infestum, Arafel, Wolfen Society, Oxidised Razor, Grindminded, Bergthron, Deflorace, Ominous, Verminous, Golem, Kabak, Somnus, Avernus, Silent Streama of Godless Elegy, Haggard, Pegazus, Nazgul, Oversoul, Pale Divine, Electric Wizard, Earthride, Disastrus Murmur, Arcturus, Anasarca, Dusk, Loudness, Napalm Death, Nightfall, Mayhem, Burzum, Pink Cream 69, Rotting Christ, Rotting Flesh, Hellfu**ed, Dark Funeral, Profanieum, Panzerchrist, Goatwhore, Tsjuder, Zyklon, X Japan, Vader, Virgin Steele, Vision of Disorder, Vital Remains, Voivod, Usurper, Ulver, Tankard, The Sins of thy belovud, Thorrs Hammer, Thors Hammer, Thyrfing, Arch Enemy, Armored Saint, Aurora Borealis, Asphyx, Autopsy, Axel Rudi Pell, Ayreon, Behemoth, Benediction, Battlewhore, Kreator, Biohazard, Bethlehem, Broken Hope, Brutal Truth, Candlemass, Carcass, Carcass Grinder, Cathedral, Celtic Frost, Cryptopsy, Destruction, Dismember, Disgorge, Manowar, Masters Hammer, Misanthrope, Morgoth, Mordeth, Morgul, Morbid Angel, My Dying Bride, Naglfar, Necrophagia, Neurosis, Nevermore, Nifelheim, October Thorns, Opressor, Orphaned Land, Judas Isacariot, Jungle Rot, Jag Panzer, Immolation, Impaled Nazerine, Impellitteri, In Battle, Incantation, In Extremo, In Flames (pre Clayman), Isengard, Hammerfall, Hecate Enthroned, Helloween, Hellhammer, Hellwitch, Exhumed, Funeral, Funeral Winds, Forlorn, Gamma Ray, Gorerotted, Lacuna Coil, Lumbonic Art, Paradise Lost, Sentenced, Pestilance, Pessimist, Pig Destroyer, Rage, Samael, Savatage, Sepultura (pre chaos ad), Skyclad, Slayer, Skyfire, Sodom, Suffocation
Some example songs in various genre's ....
For the Bands that cross the boundries too much to be considered one style category: I list
Opeth *.* (from what I can tell, they seem incapable of writing a bad song. Some of my very favorites are Black Rose Immortal, A Fair Judgement, Harvest, Deliverance, Bleak, The Drapery Falls, The Funeral Portrait, Patterns in the Ivy, Blackwater Park, Advent, To Bid You Farewell, Forest of October, Windowpane, and Death Whispered a Lullaby )
The Gathering - They started off as a death metal band (with the release of always) now they are not even metal anymore, but still a good rock band with an awesome singer.
For the grind & death sytle...
Death - Scream Bloody Gore (well, anything by Death, as they were the first technical death band I got into, back in the mid 90s)
Bloodbath - The Soul Collector, Bathe in Blood, So You Die, and Ways to the Grave (Grind)
Isacaarum - c**shot combat, Teenage c**t powerplay, Anal Razzia, Isamahaparinibbanasuttam, Arts of farts, and G Spot Seppuka (note, some of the titles were sensored as not to offend, Grind)
Deflorace - Dungeon full of suffer, Happy Man, It was Vaclav Mrazek, and The Best of (Grind)
Ciribus - Fat Bitches, Vomulence, and Soil Bleeds Back (Grind)
Disastrus Murmur - Land Shark and Are You Dead (death)
Divine Empire - Hidden Hatred
Melodic Death Style... *** This is basicly 2 guitar power metal with death metal or hardcore style vocals ***
At The Gates - Anything and Everything by them ... They pretty much created the genre
In Flames - Episode 666
Dark Tranquility - The Same
Children of Bodom - Needed, and Hate Crew Deathroll
For Black Metal...
Abigor - Repulsor, Battlestar Abigor, Galaxies and gone Decline, Abysmal Scorn, Midwinters Obliteration and Satans Galaxy (best described as harmonic black metal)
Einherjer - Far Far North, Satyricon - Mother North and Dark Medieval Times (Best described as Melodic Black "Viking" metal)
Finntroll - vindfard manniskopesten (best described as Melodic Folk Black Metal)
Arafel - On the Dark Way (melodic Black, slight folk influence)
Power Metal ...
Nightwish - Anything and everything by nightwish kicks serious ass, however, to appreciate it, you have to like Tarja's opera style singing
Helloween - Eagle Fly Free, Keeper of the Seven Keys, Dr Stein, Future World, and Halloween
Hammerfall - In Memoriam, Crimson Thunder, and The Unforgiving Blade
Doom Metal
Saturnus - They are masters of this genre, calm, slow, relaxing, and some of the most depressing sounding stuff I have ever Heard. Examples (For your Demons, thou art Free, Drown my Sorrow, Empty Handed, Lost my Way, and Thus my Heart Weepeth for thee)
Novembers Doom - Amazing Doom metal band from chicago, Their first release (Amid its Hallowed Mirth is kinda boring to me, but everything since then has been great. The Knowing is my favorite cd of theirs. Example tracks(Awaken, Harmony Divine, Shadows of Light, Silent Tomorrow, In Faith, Searching for the Betrayal, Last God, In Memmories Past, The Day I return, and Aura Blue)
Then for good old fashioned Heavy Metal
Anything by Iron Maiden or Motorhead is good
For Thrash ... I like Kreator, Destruction, Overkill, Tankard, older Anthrax, older Megadeth, and Slayer ... however there are many many more then just that.
EDIT .... part of my post is a repost of my post in an older thread (though I have added a bit to it here)
Other post in case anything there interests you ...
http://forums.anandtech.com/me...62&highlight_key=y