Well, a true masterpieces have to achieves some conditions.

I'm going to say : Kilkus - The Pattern of Self Design

Only 1 album from this band, but what a album. Just awesome.

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1. korpiklaani-Tales Along This Road 
2. pink floyd-the wall
3. dark tranquillity-fiction
4. him-deep shadows and brilliant highlights,venus doom,uneasy list. vol 1-2...
5. agathodaimon-serpents embrace
6. metallica-metallica
7. deep purple-made in japan
8. hammerfall-Chapter V : Unbent, Unbowed, Unbroken 
9. haggard-Eppur Si Muove
10. MDB-for lies i sire
11. tiamat-Prey
12. deathstars-Termination Bliss,Night Electric Night

 and more.....

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"It's a bad trip on a SinKing ship, when no-one seems responsible
Scapegoat to rock the boat, yeah, we need someone expendable
Volunteers to face the fears, can we be

At least the song Hysteria is so lame mostly because of the singing :D
(just my lame opinion, haven't heard whole album...)

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- S1mppa -

Pure Masterpieces to me wer
Slayer's Seasons in The Abyss
Pantera's Far Beyond Driven
Down's NOLA
Exodus's Shovel Headed Killing Machine
Motorhead's Inferno
Ozzy's Blizzard of Ozz
Cannibal Corpse's Tomb of the Mutilated (which changed my opinon on Death Metal forever)

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Not in order:
Hammerheart by Bathory
Tomb of the Mutilated and Butchered at Birth by Cannibal Corpse
In the Nightside Eclipse by Emperor
De Mysteriis Dom Sathanas by Mayhem
Reign in Blood by Slayer
Paranoid by Black Sabbath
Reek of Putrefaction and Symphonies of Sickness by Carcass
Scum by Napalm Death
Vikingligr Veldi, Hordanes Land, Yggdrasill, and Nema by Enslaved
...En Their Medh Riki Fara... by Falkenbach
Filosofem, Dauði Baldrs, and Hliðskjálf by Burzum

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92% of teens have moved
onto rap. If you are Part of the 8% that
still rock out every day, copy and
paste this into your si

I also love "Beyond the Veil" from Tristania. It's a perfect album, I listened to it countless times and never got tired of it. Too bad that, with the new changes, we probably won't see more albuns like this from this band...

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Six Feet Under's 13
Slayer's Hell Awaits and Reign in Blood
Anthrax's Among the Living and Spreading the Disease
SOD's Speak English or Die

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The latest albums that impressed me were:

Lechery - same
Megadeth - Endgame
Solitue Aeturnus - Alone
Cage - Science of Annihilation

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For me:
Iron Maiden "Number of the Beast"
Helloween Keepers of the seven keys I & II
Blind Guardian "Nightfall in middle Earth"

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This one is a true Masterpiece as well, indeed.

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