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O (Fin, black metal) See also: ...And Oceans
O - mCD - 2004

Oathean (S. Korea, black/death metal)
The Eyes of Tremendous Sorrow - CD - 1998
Fading Away into the Grave of Nothingness - CD - 2004
With live bonus track.
The Last Desperate 10 Years As Ever - CD - 2003
Oathean - CD - 2010

Obduktion (Gre, death metal)
II - CD - 2008

Obeisance (US)
Lucifer Master - CD - 2002
CD includes an unlisted bonus outro-type track. Backing band here is The Chasm members.

Obitania (Spa, ambient)
Pagan Crystal Sphere - CD - 2002

Obituary (US, death metal)
Anthology - CD - 2001
Compilation of tracks up through the "Back from the Dead" album, plus an unreleased Venom cover from the "World Demise" sessions and an industrial-style mix of "Boiling Point."
Back from the Dead - CD - 1997
Cause of Death - CD (with 3 bonus) - 1990/1997
Remaster with 3 bonus demotracks. Celtic Frost cover.
Dead - live CD - 1998
The End Complete - CD - 1992
Frozen in Time - CD (with 2 bonus) - 2005
Japan press with 2 bonus live tracks from Dynamo '05.
Godly Beings (split with Sepultura) - bootleg CD
Dynamo Open Air '91.
It's Killing Time - bootleg CD
Live Dynamo, Eindhoven, Holland, April 11, 1992.
Morbid Confessions - bootleg CD
Supposedly live Jan. 1, 1988, and 2 tracks from another unknown early gig.
Pain in the Last Path - bootleg CD
Live Europe '92.
Slowly We Rot - CD (with 2 bonus) - 1989/1997
Remaster with the Xecutioner 1986 demo as bonus tracks.
World Demise - CD - 1994
Xecutioner's Return - CD (with 3 bonus) - 2007
Japan press including the bonus track 'Executioner Returns' some other versions have, plus 2 additional live bonus tracks.

Obligatorisk Tortyr (Swe, death/grind)
Obligatorisk Tortyr - CD - 2000

Oblique Visions (Malta, dark/doom)
Seas of Serenity - CD - 1995

Obliterate (Slovakia, death/grind)
The Feelings - CD - 2000
Tangled Ways - CD - 2003
Testimony cover.

Obliveon (Can, thrash)
First demo is straightforward thrash, they gradually get more technical/progressive.
Cybervoid - CD - 1995
From this Day Forward - CD - 1990/2007
Nemesis - CD - 1993
Whimsical Uproar - mCD - 1997
2nd demo from 1987 pressed on CD.

Obliviated See listing for Serpent's Spawn

Oblivion Knight (US, heavy metal) See also: Militia, Majesty
Oblivion Knight - CD - 2009
CD reissue of the band's 1987 and 1990 demos.

Oblomov (Cze, black/death metal)
Communitas (Deconstructing the Order) - CD - 2009
Wishing the Renaissance - CD - 2003

Obscene Crisis (Can, death metal)
Silence of the Mind - CD - 1995

Obscene Eulogy (Can, black/death metal)
A Portal into Fire - CD - 2002/2003
The 2002 demo on CD with an added intro.
Defining Hate: The Truth Undead - CD - 2004

Obscene Gesture (US, crossover) Also see: Agent Steel
Living in Profanity - CD - 2007

Obscene Jester (US)
Citadel's On Fire - CD - 2015
The 1989 cassette EP + 11 bonus mix references for their unreleased album.

Obscenity (Ger, death metal)
Age of Brutality - demo - 1992
Demo-Niac - CD - 1999
Rerelease of the 'Age of Brutality' '92 and 'Amputated Souls' '93 demos.
Suffocated Truth - CD - 1992
The 3rd Chapter - CD - 1996

Obscura (Ger-Munich, technical death metal)
Cosmogenesis - CD - 2009

Obscure (Spa, death metal)
Curse the Course - demo - 1991

Obscure (Turkey, black metal)
Shedded Blood - CD - 2007

Obscure Devotion (Ita, black metal)
Son of a Dayless Night - CD - 1999

Obscure Infinity (Swe, death metal)
Beyond the Gate - demo - 1992
split with Fulmination - LP - 1994
Tracks from unreleased split LP.

Obscure Mind (Bra, black metal)
Under the Black Shadows (split with Lost Graveyard) - CD - 2004

Obscure Vortex (Ger, black metal)
Was Einst War... - CD - 2005

Obscurity (Swe-Järfälla, death metal)
Wrapped in Plastic - CD - 1992

Obscurity (Swe-Malmö, death metal)
Damnation's Pride - CD - 1998
The 1986 and 1987 demos and an unreleased 2-song demo from 1992.
Damnation's Pride - demo - 1987
Ovations to Death - demo - 1986

Obsecration (Gre, death metal)
The Inheritors Of Pain - CD - 1996
Sins of the Flesh - CD - 2002

Obsessed, The (US, doom metal)
See also: 'Metal Massacre 6.'
Live at the Wax Museum - live CD - 1997
Live Washington, D.C. July 3, 1982.
Streetside/Blind Lightning - mCD - 1994

Obsession (Fin, power metal with gothic elements)
Eye of Drama - mCD - 1998

Obsession (US, heavy metal)
See also: 'Metal Massacre 2' comp.
Marshall Law - mCD - 1984
Methods of Madness - CD (with 2 bonus) - 1987/2000
Methods of Madness - LP - 1987
Scarred for Life - CD (with 2 bonus) - 1986/2000
Scarred for Life - LP - 1986

Obsidian Gate (Ger, black metal)
Colossal Christhunt - CD - 2001

Obskene Sonare (Austria, black metal)
Todnachten - CD - 2007

Obskure (Brazil, death metal)
Early '90s style DM with atmospheric interludes/passages.
Overcasting - CD - 1997
Includes tracks from '96 promo tape as bonus.

Obstruction (Hun, heavy metal)
Horizont - CD - 2003
Új Vér - CD - 2000

Obtained Enslavement (Nor, black metal)
Witchcraft - CD - 1997

Obtenebris (Can, death/black metal)
Dust of Time - CD - 2009

Obtest (Lith, black metal)
Tukstantmetis - CD - 1997

Obtruncation (Neth, death metal)
The Callous Concept - CD - 1997
Sphere of the Rotting - demo - 1992

Obus (Spa, heavy metal) See also: Venganza
Dejarse la Piel - CD - 1986
Desde el Fondo del Abismo - CD - 2000
El Que más - CD - 1984
En directo 21-2-87 - live CD - 1987/2000
Pega con Fuerza - CD - 1985
Poderoso Como el Trueno - CD - 1982
Prepárate - CD - 1981

Ocean (Fra, heavy metal)
Ocean - CD (with four bonus) - 1981/2000
Includes the entire live side of 'Rock Dur!' LP as a bonus.

Ocean (Swe, hard rock) Pre-Overdrive
See Everybody/Bad Things - EP - 1978

Oceana (Ita, gothic/doom, doom/death) See also: Novembre
Oceana - mCD - 1996
The '95/'96 promo reissued with bonustracks.

Ocean Chief (Swe, doom metal) Ex-Traumatic and Catapult the Smoke members
The Northern Lights (split with Runemagick) - CD - 2007

Oceans of Sadness (Bel, death/black with gothic elements)
For We Are - CD - 2000

Occult (Neth, black metal, black/thrash) See also: Legion of the Damned, Bestial Summoning, Sinister
Earlier stuff is more regular black metal.
Elegy for the Weak - CD (with 1 bonus) - 2003
US press with bonustrack 'Until the Battle.'
The Enemy Within - CD - 1996
Of Flesh and Blood - CD - 1999
Prepare to Meet Thy Doom - CD - 1994
Rage to Revenge - CD - 2001

Occultus (Colombia, black metal)
Cosmos - CD - 1997
Dark Passion (split with Esgaroth) - CD - 1997

Occultus (Fra, black metal)
Inthial - CD - 2010

Octagon (US, black metal)
Artisans of Cruelty - CD - 2005

Octinomos (Swe, black metal) See also: Algaion, Puissance
Fuckhole Armageddon - CD - 2001

October (US, sludge/metal)
Positively Negative - CD - 1997

October 31 (US, heavy metal) See also: Deceased, Doomstone, K-Octave
See also '...And the Scene Goes On...2' comp.
The Fire Awaits You - CD - 1997
Witchkiller cover.
Meet Thy Maker - CD - 1999
Saxon cover.
Stagefright - live CD - 2003
Saxon cover.
Visions of the End - mCD - 1998
Original 5-track version. Lizzy Borden cover.
Visions of the End - CD (with 5 bonus) - 1998/1999
Reissue with 5 bonus, Jag Panzer/Warlord covers.
Voyage to Infinity - demo - 1996

Ocultan (Brazil, black metal)
Atombe Unkuluntu - CD - 2010
Bellicus Profanus - CD - 1999

Odar (Bosnia, black metal)
Zavjet Dalekom Snu - CD - 2008/2009

Řdelegger (Ger, black metal)
Solitary in Wrath - CD - 2011
Split with Vordr - EP - 2006

Odhinn (Swe) See also: In Battle
From a Splendourus Battle - CD - 1998

Odious Mortem (US, death metal)
Cryptic Implosion - CD - 2007

Odyssey (US, thrash)
Catharsis - CD - 2000
Speak No Evil - CD - 1994

Offense (Spa, death/doom)
Aside - CD - 1996

Offering (Swi, death metal)
The Ultimate Offering - mCD - 1993

Of Human Bondage (Can)
The Goat Sessions Volume 1 - CD - 2001

Of the Fallen (US, black metal)
Of the Fallen - CD - 1998

Ogmias (Cze, black metal)
3 - CD - 2007
6 new tracks plus the entire '02 'Keltský Hnev' album.

Ohuzaru (Ita)
Collection (split with L'Amico di Martucci) - CD - 2005
S.O.D. cover. Has all their recordings except the full-length. Includes their 2000 s/t 7", their 2000 track from the 'Be Quick or Be Dead" comp. 7", their side of the 2001 split 7" with Cyness, and the 'Thrash is Business" 2001 5".

Oktober (US, black metal)
Heathen Pride - CD - 1998

O.L.D. (US)
First album is grind, later stuff is avant-garde weirdness
Formula - CD - 1995
Lo Flux Tube - CD - 1991
Old Lady Drivers - LP - 1988
With a reworking of Regurgitation's 'Bathrooms Rule.'

Old Corpse Road (UK)
The Bones of This Land Are Not Speechless (split with The Meads of Asphodel) - CD - 2010

Old Funeral (Nor, death metal) See also: Immortal, Hades, Burzum
Abduction of Limbs - demo - 1990
Devoured Carcass - EP - 1991
Grim Reaping Norway - CD - 2005
Two '91 shows. Agathocles/Slaughter covers.
The Older Ones - CD - 1999
Compilation of old material including a live track.
Our Condolences 1988-1992 - 2CD - 2013
'The Fart That Should Not Be' '89 demo, live '91 tracks, 'Abduction of Limbs' '90 demo, 'Devoured Carcass' '91 EP, '91/'92 studio tracks, and another '91 live track.
Skin and Bone - CD - 201?
Bootleg, includes all tracks from 'The Older Ones' compilation and an Aug. 30, 1991 live show in Bergen.

Old Man Gloom (US)
Seminar II: The Holy Rites of Primitivism Regressionism - CD - 2001

Old Man's Child (Nor)
Born of the Flickering - CD - 1995
In Defiance of Existence - CD - 2003
In The Shades Of Life - mCD - 1994/1996
mCD version of their sole '94 demo.
The Pagan Prosperity - CD - 1997
Revelation 666: The Curse Of Damnation - CD - 2000

Old Pagan (Ger, black metal)
The Sign of the Battle Dragon - CD - 2006
Zyklon-B cover.

Old Yron (Ita, heavy metal)
Old Yron - CD (with 2 bonus) - 1989/2009
Reissue of the 1989 LP. Includes 2 bonus tracks from the early 2000s by guitarist Antonio Ferrari.

Omega (UK, NWoBHM) See also: Apocalypse
The Prophet - CD - 1985

Omega Point (US, progressive metal)
Infinite Rhyme - CD - 1991/2009
CD reissue of the '91 demo.

Omen (Hun, heavy metal) See also: Pokolgép, Kalapács
A Hetedik Nap - CD - 2006
Anarchia - CD - 1993
Brutális Tangó - CD - 1992
Idegen Anyag - CD - 1997
Jelek - CD - 1994
Koncert - live CD - 1994

Omen (US, heavy metal) See also: Savage Grace, Step Child
Battle Cry - CD - 1984
Battle Cry - CD (with 2 bonus) - 1984/2003
Reissue with 'Metal Massacre'/live tracks.
The Curse - CD - 1986
Escape to Nowhere - CD - 1988
Into the Arena - CD - 2011
Includes 6 live tracks from '85, 4 '84 demo versions of 'Warning of Danger' tracks, 2 re-recorded archive tracks (unclear when these are from), and a track circa 2000.
Nightmares - mCD - 1987
Reopening the Gates - CD - 1997
Warning Of Danger - CD - 1985
Warning of Danger - CD (with one bonus) - 1985/2003
Reissue with a live track.

Omendark (Spa, black metal)
Ipar Basoetan/Na Fraga Do Norte (split with Xerión and Nakkiga) - CD - 2005

Omission (Spain, thrash)
Merciless Jaws from Hell - CD - 2011
Thrash Metal is Violence - CD (with 2 bonus) - 2009/2010
Reissue with 2 2008 live tracks as bonuses.

Omnitron (Swe, thrash) Krixhjälters/pre-Comecon members
Masterpeace - CD - 1990
'Ace of Spades' cover.

Omnium Gatherum (Aus't, death/grind)
Rectifying Human Rejection - CD - 2001

Ondskapt (Swe, black metal)
Dödens Evangelium - CD - 2005

One, The (Gre, black metal) See also: Macabre Omen
Guardians Inhuman - CD - 2003

One Master (US, black metal)
The Quiet Eye of Eternity - CD - 2009

On Horns Impaled (Ger, black metal)
Total World Domination - CD - 2009
Darkthrone cover, and unlisted G.G. Allin cover.

Onirik (Port, black metal)
Our Funeral Yet to Come (split with Morte Incandescente) - CD - 2005
Spectre - CD - 2007

Onirot (Ita, dark ambient)
Augusta Taurinorum - CD - 2001

Onkel Tom See Angelripper, Tom

Onslaught (UK, thrash, death metal)
The Force - CD - 1986
Hell in Copenhagen
Live Mar. 28, 1987. 'In Search...' and 'The Force' songs done by 'The Force' lineup.
In Search of Sanity - CD - 1989
Angel Witch cover.
In Search of Sanity - 2CD - 1989/2016
Includes extra live disc live at the Hippodrome, Bristol, UK, July 9, 1989.
Killing Peace - CD (with 1 bonus) - 2007
Japanese press with a re-recording of 'Power from Hell' as a bonus track.
Let There Be Rock (Sy Keeler version) - mCD - 1987
Sy Keeler vocals version of the AC/DC song, with live versions of 'Metal Forces' and a 'Power from Hell/Angels of Death' medley
Let There Be Rock (Steve Grimmett version) - mCD - 1989
Steve Grimmett vocals version of the AC/DC song, and live '88 versions of 'Shellshock' and 'Metal Forces.'
Live Polish Assault 2007 - live CD - 2007
Live Stodoła Club, Warsaw, Poland, Feb. 12, 2007.
Power from Hell - CD - 1985
Sounds of Violence - CD (with 3 bonus) - 2011
Japanese press with 3 bonus (Motörhead cover and 2 re-recorded 'Power from Hell' tracks.

On Thorns I Lay (Gre, death/doom with gothic elements)
Egocentric - CD - 2004
Now more like The Gathering.

Onward (US, power metal) See also: Darken, Toby Knapp
The Neverending Sun - CD - 2007
2002-2003 recordings.

Open Fire (Poland, heavy/speed metal)
**See also: 'Metalmania 88' comp.
Demo - 1985
Demo - 1987
Metalmania '87 (split with Stos) - live LP - 1988

Opera IX (Ita, black metal)
The Call of the Wood - CD - 1995
Sacro Culto - CD - 1998

Operation Winter Mist (Can)
Allegiance of the Profane Pack (split with Ruina and Tundra) - CD - 2007
Slaughter cover.
Winter Warfare II - CD - 2004
Compilation of the 'Winter Warfare' '02 CD-R, 2003 studio tracks, and 4 '02 live tracks. Bathory cover.

Opeth (Swe) See also: Bloodbath
Damnation - CD - 2003
Orchid - CD - 1997
Still Life - CD - 1999/2000

Ophiolatry (Brazil, death metal)
Opposite Monarchy - demo - 1999
Opposite Monarchy (split with Ancestral Malediction) - mCD - 1999
Two tracks from the demo of the same name.

Ophis (Ger, death/doom)
Nostrae Mortis Signaculum - CD - 2004

Ophthalamia (Swe, black metal) See also: Abruptum, Dissection
A Journey In Darkness - CD - 1994
Jon Nödtveidt on vocals.
A Long Journey - CD - 1998
"Corrected" and re-recorded version of 'A Journey...' with All on vocals. Venom cover.
Via Dolorosa - CD - 1995
Mayhem cover.

Opitz (Cze, death/grind)
Globální Orgie - Striktní Protokol - CD - 2009
Dismember cover.

Oppression (Swe, thrash)
Thrash Clash Volume 2 (split with Diamond Plate) - CD - 2008
Includes 2004-2006 tracks.

Oppressor (US, death metal)
As Blood Flows - demo - 1993
European Oppression Live+As Blood Flows - CD - 1995
Live '95 tracks, '95 studio tracks including a M�tley Cr�e cover, and the demo.
Solstice of Oppression - CD - 1994
Original press on Red Light, retaining the original mix.

Opprobrium (US, death/thrash) Ex-Incubus
Discerning Forces - CD - 2000

Opus Malefici (Ita, black metal)
Obscure Thoughts - mCD - 1998

Oracle (Indonesia, thrash)
No Truth, No Justice - CD - 2010/2012

Oracle (US, power/progressive metal)
As Darkness Reigns - CD - 1993

Orakle (Fra, black metal)
L'ineffable émoi... - mCD - 2002

Orange Goblin (UK, stoner metal)
Time Travelling Blues - CD - 1998
Includes unlisted 'Sober Up' track.

Orategod (Chile, death metal)
Fall Slowly Until the Hell Abyss - CD (with 4 bonus) - 2004/2006
2006 reissue with the 'From the Dark Immortals' '02 EP as bonustracks.

Orcrist (Ita, black metal)
Black Blood Raised - CD - 2006

Orcus (US-PA)
The Forgotten Prayer - CD - 2002

Ordeal (Bel, death metal)
Atrocities - CD - 2006

Order From Chaos (US) See also: Vulpecula, Angelcorpse
**Also see 'Midwest Metalfest' comp.
And I Saw Eternity - mCD - 1996
An Ending In Fire - CD - 1998
Crushed Infamy - demo - 1989
Dawn Bringer - CD - 1995
Voivod cover.
Imperium - The Apocalyptic Visions - CD - 2005
'Inhumanities' demo, 1988 rehearsal, and live March 1994.
Inhumanities - demo - 1988
Live Into Distant Fears - EP - 1994
Pain Lengthens Time - live EP
Plateau Of Invincibility - mCD - 1994
Venom/Sodom covers.
Stillbirth Machine - CD - 1992
Will to Power - EP - 1990

Order of Nine Angles (UK)
The Self-Immolation Rite - CD - 1997
Composed by Christos Beest aka Richard Moult and whatever other aliases. Spoken word narration over ambient music. Supposedly recorded in 1991 and remixed with additional recordings added in 1997.

Order of the Ebon Hand (Gre, black metal)
**Also see the Bathory tribute 'Hellas Salutes the Vikings'
XV:The Devil - CD - 2005

Order of the White Hand (Fin, black metal)
Through Woods And Fog - CD - 2008

Ordo Draconis (Neth, black metal)
In Speculis Noctis - mCD - 1999
The Wing & the Burden - CD - 2001

Ordog (Fin)
Life is too Short for Learning to Live - CD - 2008
Remorse - CD - 2011

Ordo Templi Aeternae Lucis (Fra, black metal)
split CD with Gorgon - CD - 2011
Blessed in Sin cover.

Organic Infest (US/Puerto Rico, death metal)
Agony - mCD - 2001
Black Sabbath cover.
Penitence - CD - 1993
The Way to Temptation - CD - 2003

Organization, The (US) Death Angel members
The Organization - CD - 1993
Savor the Flavor - CD - 1995

Orgy of Pigs (Aus't, death metal)
Where Feelings Die - CD - 1992

Oriŕlix (Fra, heavy metal)
La Geste d'Oriŕlix - demo - 1987

Orifice (Ita, grind)
These are the Flowers that I Love to Smell - CD - 2007/2010
2010 CD reissue of the '97 CD-R.

Original Sin (US, speed/heavy metal) See also: Virgin Steele
Sin Will Find You Out - LP - 1986

Orkus (Ger, black metal)
Thorns - CD - 2001
Sodom cover.

Ornaments of Sin (Fra, black metal)
Inhale Zyklon-B - mCD - 2003
Burzum cover.

Ornias (Swe, black metal)
Death Bringer - CD - 2007

Orodruin (Neth, black metal) See also: Haat
Split with Vordr - EP - 2004

Orphanage (Neth, death/doom metal) See also: Celestial Season
At the Mountains of Madness - CD - 1997
Two different mixes of 'By Time Alone' album tracks and 3 live '96 tracks.

Orthanc (Fra, black metal)
Aux Enfants de Thulée - CD - 2005
Includes two live tracks from a June 2004 show in Switzerland (including Kristallnacht cover).

Orthodox (Spa)
Amanecer en Puerta Oscura - CD - 2007

Osbourne, Ozzy (UK)
Blizzard of Ozz - CD (with 1 bonus) - 1980/2002
Remaster/rerecording with redone bass/drum parts.
Crazy Paranoia - bootleg CD
Live Salt Palace, Salt Lake City, UT, Mar. 18, 1984
Diary of A Madman - CD (with 1 bonus) - 1981/2002
Remaster/rerecording with redone bass/drum parts.
Diary of A Madman - CD - 1981/1995
22-bit remaster.
Down to Earth - CD - 2001
Just Say Ozzy - CD - 1990
Live EP with 4 Ozzy tracks and 2 Black Sabbath tracks.
L.A. Madness - bootleg CD
Live Irvine Meadows Amphitheater, Irvine, CA, June 12, 1982.
Let Me Hear RR - bootleg CD
Live Sophia Gardens, Cardiff, Wales, UK, Nov. 30, 1981
Let Me See Your Hands - bootleg 2CD
Live Palladium, Hollywood, CA, Oct. 27, 1995
Paranoid Man - bootleg CD
Live Kemper Arena, Kansas City, MO, April 1, 1986.
Speak of the Devil - CD - 1982/1991
Tribute/Randy Rhoads Tribute - CD - 1987/2002
Live 1981 and outtakes of 'Dee.'
Under Cover - CD - 2005
All covers, including King Crimson, Cream, Mountain, Mott the Hoople, Mountain, the Beatles, etc.
The Ultimate Sin - CD - 1986
The Ultimate Sin - CD - 1986/2005
Remaster.
U.S.A. 1983 - bootleg CD
Actually Salt Palace, Salt Lake City, Utah, Mar. 18, 1984, plus one track from Music Hall, Cleveland, OH, May 11, 1981.

Orthrelm (US)
split with Behold... the Arctopus - CD - 2006

Osculum Infame (Fra, black metal)
Dor-Nu-Fauglith - CD - 1997

Osirion (Fra, black metal)
Har Sabbat - CD - 2005
Impaled Nazarene cover.

Osiris (Neth, technical thrash)
Futurity and Human Depressions - CD - 1992
Futurity and Human Depressions - 2CD - 1992/2015
Reissue with bonus disc including the 1991 'Equivocal Quiescence' and 1989 'Inextricable Reversal' demos.

Oskal (Rus, black metal)
Stahlkrieg/Blazes of Sunset - CD - 2004/2008
CD reissue of the 2 '04 demos. 'Blazes of Sunset' is totally instrumental.

Osmi Putnik (Croatia, heavy metal, hard rock)
Glasno, Glasnije/Drage Sestre Moje...Nije Isto Bubanj i Harmonika - CD - 1987/1988/2006
CD reissue of the band's 2nd and 3rd albums.

Ossian (Hun, heavy metal) Also see: Pokolg�p, Kalap�cs, Metal Lady
**Older material is traditional heavy metal, post-'99 is power metal.
86-92 - CD - 1992
Best of with re-recordings and an unreleased new track.
Acélszív - CD (with 2 bonus) - 1988
Acélszív - LP - 1988
Árnyékból a Fénybe - CD - 2002
A Szabadság Fantomja - CD - 2005
Includes 5 2004 live tracks as bonuses.
Az Utolsó Lázadó - CD - 1999
New songs, re-recordings, and live tracks.
Emberi Dolgok - CD - 1993
Félre az Útból - CD (with 3 bonus) - 1989/2002
Félre az Útból - LP - 1989
Fémzene - CD - 1999
Gyújtópontban - CD - 2000
Hangerőmű - CD - 2003
Ítéletnap - CD - 1991/2003
Keresztút - CD - 1994
Kitörés - CD - 1992
Koncert - live CD - 1998
Titkos Ünnep - CD - 2001
Tűzkeresztség - CD - 2004
Includes 2004 re-recordings of 2 'Gyújtópontban' tracks and a short version of 'Tűzkeresztség II' as bonus tracks.

Ossuary (Uruguay, death metal)
We Await the Secret Conspiracy - mCD - 1998
Sarcófago cover.

Ostrogoth (Bel, heavy metal)
**See also the 'Mausoleum: The Official 20th Anniversary Concert Album' comp.
Ecstasy and Danger - CD - 1984
Ecstasy and Danger/Full Moon's Eyes - CD (with one bonus) - 1983/1984/2002
First mLP and album, with a bonus of the 'Ecstacy and Danger' version from the 'If It's Loud...' comp.
Feelings of Fury - CD - 1987
Too Hot - CD - 1985

Ouija (Spa, black metal)
Riding Into the Funeral Paths - CD - 1997

Outbreak (Can, heavy metal) See also: Dissection
Master Stroke - LP - 1986

Outburst (Fra, thrash)
Fuck the Engineers - demo - 1986

Outcast (Aus't, heavy metal)
Outcast - CD - 2014

Outrage/b> (Ger)
Go to Hell - CD - 2011

Outrage (Japan, thrash)
Awakening 2008 - 2CD - 2008
CD1 is 'The Final Day' album performed live at Shibuya Boxx on Mar. 8, 2008. CD2 is the 'Life Until Deaf' album performed live at Shibuya Boxx on Mar. 15, 2008.
Black Clouds - CD - 1988/2010
Blind to Reality - CD - 1989/2010
The Final Day - CD - 1991
The Final Day - CD - 1991/2010
The Great Blue - CD (with 3 bonus) - 1990/2010
Reissue with the tracks from the 'Love Song' CD single ('91) as bonus ('Love Song,' 'I Feel Alright,' and a cover of the Ramones' 'Blitzkrieg Bop.'
Life Until Deaf - CD - 1995
Outrage - CD - 1987/2007
CD reissue of their '87 EP.
Outrage - CD - 1987/2010
CD reissue of their '87 EP.
We Suck! You Suck! Outrage Re-Mix - CD - 1998
Industrialish remixes by Shige (Chronic).
The Years of Rage - CD - 2008
20th anniversary live album, Shibuya Boxx 2007/11/9.

Outside (Ger, heavy metal)
Never in Security - CD (with 1 bonus) - 1988/2014

Overdose (Bra, thrash)
Generally, albums get more modern-influenced sequentially.
Circus of Death - CD - 1992
Progress of Decadence - CD - 1993

Over Dose (Fra, heavy/speed metal)
Chasse ďż˝ l'Homme - demo - 1988

Overdose (Ger-Frankfurt, heavy metal)
Tight Action - CD (with 4 bonus) - 1985/2009
Reissue of the '85 album including the entire 1984 'Heavy Metal' demo as bonustracks.

Overdrive (Swe, heavy metal) See also: Paradize, Ocean
Metal Attack - CD (with 5 bonus) - 1983/1995
Japanese press with 5 '81 bonus tracks.
Metal Attack - CD (with 5 bonus) - 1983/2003
Reissue with 5 '83 instrumental demo tracks as bonuses (different bonuses from Japanese press).
Mission of Destruction: Live - CD - 2001
Live '82/'85/'97 and two '82 studio tracks.
Overdrive - EP - 1980/2001
Reissue of the 1980 demo on picture EP.
Reflexions - EP - 1982
Reflexions - CD (with 14 bonus) - 1982/2003
Reissue of the EP with various demo/compilation/etc. bonustracks.
Swords and Axes - CD - 1984
Swords and Axes - CD (with 6 bonus) - 1984/2003
Reissue with the '93 reunion demo and 2 '85 tracks (pre-production for a never released third album) as bonuses.

Overdrive (UK, NWoBHM)
On Wizard Ridge - CD - 2005
2004 recordings of '79-'81 tracks.

Overkill (US)
Elvis is Dead - bootleg CD
Live New Jersey '92.
Feel the Fire - CD - 1985
Fuck You and Then Some - CD - 1996
'Fuck You' EP with 2 more live tracks and the 'Overkill' EP added.
Hello from the Gutter - bootleg CD
Live NY '90. Seems to be parts of two different shows.
Horrorscope - CD - 1991
I Hate - bootleg CD
Live Allentown, PA, 1990.
I Hear Black - CD - 1993
The Killing Kind - CD (with 3 bonus) - 1996
Includes 3 bonus tracks: 'Killogy' and Black Sabbath/Judas Priest covers.
The Masters of Destruction - bootleg CD
Live Stuttgart, GermanyNov. 19, 2000 and some extra live '90 tracks.
Necroshine - CD - 1999
Overkill - EP - 1985
Power in Black - demo - 1983
Rotten to the Core - bootleg CD
The first demo, s/t EP, live NY Jan. 27, 1990, and live Bochum, Germany May 12, 1986.
Taking Over - CD - 1987
Under the Influence - CD - 1988
W.F.O. - CD - 1994
Secret cover medley of 'The Ripper,' 'Heaven and Hell,' and 'Voodoo Chile.'
Wrecking Everything: Live - live CD - 2002
The Years of Decay - CD - 1989

Overkill L.A. (US, crossover/thrash) See also: Bitch
Also see 'Metal Massacre 2' comp.
Triumph of the Will - CD - 1985

Overload (China, thrash)
Overload - CD - 1996
Various tracks ('The Shadows of Ancestors'/'The Ruined City')
Presumably from a compilation.

Overlord (Ger, death metal)
Overlord - CD - 1994
'God of Thunder' cover.

Overlord (Pol, death metal)
In the World of Time - CD (with 2 bonus) - 1998/2009
CD reissue of the '98 album with 2 bonus tracks. Kat cover.

Overlorde (US-NC, heavy metal)
Medieval Metal Too - CD - 2012
Includes the '85 'Medieval Metal' demo, an unreleased '87 demo, and the '87 Metal Massacre 7 version of 'Keeper of the Flame.'

Overthrow (Can, thrash)
Within Suffering - CD - 1990
Within Suffering: Definitive - CD - 1990/2008
Reissue including 6 '90 live tracks and the entire 1989 'Bodily Domination' demo as bonustracks.

Oxenkiller (Fra, heavy metal)
Demo - 1983
Demo - 1984
Demo - 1985
Early versions of some mLP songs.
Monster of Steel - mLP - 1987

Oxiplegatz (Swe)
With Alf Svensson of At the Gates/Liers in Wait/Grotesque etc. etc.
Worlds and Worlds - CD - 1996

Oz (Fin, heavy metal)
**Also see 'Scandinavian Metal Attack' comps.
Fire in the Brain - CD - 1983
Roll the Dice - CD - 1991
Vinyl Tracks - CD - 2012
5 tracks each from the '86 'Decibel Storm,' '82 'Heavy Metal Heroes,' and '84 'III Warning' albums, plus the song 'Turn the Cross Upside Down.'