Hard/Heavy-O

 

Obituary

Slowly We Rot(1989)
Cause Of Death(1990)
The End Complete(1992)
World Demise(1994)
Back From The Dead(1997)
Dead(1998)
Frozen In Time(2005)
Xecutioner's Return(2007)
Left To Die(2008)ep
Darkest Day(2009)
Inked In Blood(2014)
Ten Thousand Ways To Die(2016)
Obituary(2017)
Slowly We Rot - Live & Rotting(2022)
Cause Of Death - Live Infection(2022)
Dying Of Everything(2023)
 

The Obsessed

The Obsessed(1990)
Lunar Womb(1991)
The Church Within(1994)
Incarnate(1999)
Live At The Wax Museum(2016)
Sacred(2017)
Live At Big Dipper(2020)
 

Obsession

Scarred For Life(1986)
Methods Of Madness(1987)
Carnival Of Lies(2006)
Obsession(2008)
Order Of Chaos(2012)
Carnival Of Lies(2015)
 

Odin

Don't Take No For An Answer(1985)ep
Fight For Your Life(1988)
 

The Offspring

The Offspring(1989)
Ignition(1992)
Smash(1994)
Ixnay On The Hombre(1996)
Americana(1998)
Conspiracy Of One(2000)
Splinter(2003)
Greatest Hits(2005)
Rise And Fall, Rage And Grace(2008)
Happy Hour!(2010)
Days Go By(2012)
Summer Nationals(2014)ep
Let The Bad Times Roll(2021)
 

Of Mice & Men

Of Mice & Men(2010)
The Flood(2011)※
Restoring Force(2013)※
Live At Brixton(2016)
Cold World(2016)
Defy(2018)
Earthandsky(2019)
 

OHM (Chris Poland)

Ohm:(2003)※
"Live" On KPFK 90.7 FM(2004)
Amino Acid Flashback(2005)※
Circus Of Sound(2008)※
Tsunami Jams(2012)
 

Old Man's Child

Born Of The Flickering(1996)
The Pagan Prosperity(1997)
Ill-Natured Spiritual Invasion(1998)
Revelation 666 (The Curse Of Damnation)(2000)
In Defiance Of Existence(2003)
Vermin(2005)
Slaves Of The World(2009)
 

Ol Drake

Old Rake(2015)
 

Omen

Battle Cry(1984)
Warning Of Danger(1985)
The Curse(1986)
Escape To Nowhere(1988)
Teeth Of The Hydra (The Best of Omen)(1989)
Reopening The Gates(1997)
Eternal Black Dawn(2003)
Into The Arena(2012)
Hammer Damage(2016)
 

Onslaught

What Lies Ahead?(1983)
Practise 9.9.84(1984)
Power From Hell(1985)
Demo(1986
The Force(1986)
In Search Of Sanity(1989)
Killing Peace(2007)
Live Polish Assault 2007(2007)
The Shadow Of Death(2008)
Live Damnation(2009)
Sounds Of Violence(2011)
Ⅵ(2013)
Live At The Slaughterhouse(2016)
Generation Antichrist(2020)
 

On The Rise

On The Rise(2003)
Dream Zone(2009)
 

Open Hand

The Dream(2002)
You And Me(2005)
Honey(2010)
Live At The Rainbow Bar & Grill 2010(2016)
B-Sides & Rarities : 1997-2004(2020)
 

Operation Ivy

Hectic E.P.(1988)
Energy(1989)
Operation Ivy(1991)
 

Operation: Mindcrime (Geoff Tate)

The Key(2015)
Resurrection(2016)
The New Reality(2017)
 

Opeth

Orchid(1995)
Morningrise(1996)
My Arms, Your Hearse(1998)
Still Life(1999)
Still Life(1999)
Blackwater Park(2001)
Deliverance(2002)
Damnation(2003)
Ghost Reveries(2005)
Lamentations - Live At Shepherd's Bush Empire 2003(2006)
The Roundhouse Tapes(2007)
The Roundhouse Tapes(2007)dvd
Watershed(2008)
In Live Concert At The Royal Albert Hall(2010)dvd
Heritage(2011)
Pale Communion(2014)
Deliverance & Damnation(2015)
Sorceress(2016)
Garden Of The Titans (Opeth Live At Red Rocks Amphitheatre)(2018)
In Cauda Venenum(2019)
 

Orange Goblin

Frequencies From Planet Ten(1997)
Time Travelling Blues(1998)
The Big Black(2000)
Coup De Grace(2002)
Thieving From The House Of God(2003)
Healing Through Fire(2007)
A Eulogy For The Damned(2012)
A Eulogy For The Fans... Orange Goblin Live 2012(2013)
Back From The Abyss(2014)
The Wolf Bites Back(2018)
Rough & Ready, Live & Loud(2020)
 

The Order

Son Of Armageddon(2006)
Welcome To The Metal Casino(2007)
Rockwolf(2009)
1986(2012)
Rock'N'Rumble(2016)
The Order(2020)
 

The Organization (Death Angel)

The Organization(1992)
Savor The Flavor(1995)
 

Orphan

Lonely At Night(1983)
Salute(1985)
 

Osukaru

GBG2LA(2010)
Never Too Late(2011)ep
Salvation(2012)
Triumphant(2013)※
Transition(2015)
The Labyrinth(2017)
House Of Mirrors(2018)
 

Otep

Jihad(2001)
Sevas Tra(2002)
House Of Secrets(2004)
The Ascension(2007)
Smash The Control Machine(2009)
Atavist(2011)
Sounds Like Armageddon(2012)
Hydra(2013)
Generation Doom(2016)
Kult 45(2018)
 

Outlasted

Into The Night(2016)
Waiting For Daybreak(2019)
 

Outloud

We'll Rock You To Hell And Back Again!(2009)
Love Catastrophe(2011)※
Let's Get Serious(2014)※
Destination Overdrive The Best Of Outloud(2015)
Virtual Hero Society(2018)
 

Out Of This World (Kee Marcello,Tommy Heart)

Out Of This World(2021)
 

Overkill

Overkill(1985)ep
Feel The Fire(1985)
Fuck You And Then Some(1987)
Taking Over(1987)
Under The Influence(1988)
The Years Of Decay(1989)
Horrorscope(1991)
I Hear Black(1992)
W.F.O.(1994)
Wrecking Your Neck - Live(1995)
The Killing Kind(1996)
From The Underground And Below(1997)
Necroshine(1999)
Coverkill(1999)
Bloodletting(2000)
Hello From The Gutter (The Best Of Overkill)(2002)
Wrecking Everything (Live)(2002)
Killbox 13(2003)
RELIXIV(2005)
Immortalis(2007)
Ironbound(2010)
The Electric Age(2012)
White Devil Armory(2014)
Historikill (1995-2007)(2015)box
W.F.O.(1994)
Historikill (1995-2007)(2015)
Wrecking Your Neck - Live(1995)
Historikill (1995-2007)(2015)
The Killing Kind(1996)
Historikill (1995-2007)(2015)
From The Underground And Below(1997)
Historikill (1995-2007)(2015)
Necroshine(1999)
Historikill (1995-2007)(2015)
Coverkill(1999)
Historikill (1995-2007)(2015)
Bloodletting(2000)
Historikill (1995-2007)(2015)
Hello From The Gutter (The Best Of Overkill)(2002)
Historikill (1995-2007)(2015)
Wrecking Everything (Live)(2002)
Historikill (1995-2007)(2015)
Killbox 13(2003)
Historikill (1995-2007)(2015)
RELIXIV(2005)
Historikill (1995-2007)(2015)
Immortalis(2007)
Historikill (1995-2007)(2015)
The Grinding Wheel(2017)
Live In Overhausen Part 1 Volume One: Horrorscope(2018)
Live In Overhousen Part 2 Volume Two: Feel The Fire(2018)
Live In Overhausen(2018)
The Wings Of War(2019)
 

Overland (Steve Overland)

Break Away(2008)
Diamond Dealer(2009)
Epic(2014)
Contagious(2016)
Scandalous(2020)
 

OZ

Heavy - Metal Heroes / Hey You(1982)
Fire In The Brain(1983)
III Warning(1984)
Decibel Storm(1986)
Roll The Dice(1991)
Burning Leather(2011)
Vinyl Tracks(2012)
Transition State(2017)
Forced Commandments(2020)
 

Ozone (Steve Overland,Chris Ousey)

Self Defence(2016)
 

Ozzy Osbourne

Blizzard Of Ozz(1980)
Blizzard Of Ozz(1980(2011))※
Diary Of A Madman(1981)
Diary Of A Madman(1981(2011))※
Blizzard Of Ozz ✝ Diary Of A Madman(2011)Box
 
Speak Of The Devil(1982)
Bark At The Moon(1983)
The Ultimate Sin(1986)
Tribute(1987)
No Rest For The Wicked(1988)
No More Tears(1991)
Live & Loud(1993)
Ozzmosis(1995)
The Ozzman Cometh(1997)
Down To Earth(2001)
Live At Budokan(2002)
The Essential Ozzy Osbourne(2003)
Under Cover(2005)
Prince Of Darkness(2005)
Black Rain(2007)
Scream(2010)
Memoirs Of A Madman(2014)
Ordinary Man(2020)
Patient Number 9(2022)