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	Titel / Band	Release	Tracks
	Obedience Thru Suffering Crowbar	26.09.1991  Grindcore Int.	10
	Objection Overruled Accept	25.12.1992  RCA Records	12
	Obscura Gorguts	23.06.1998  Olympic Recordings	12
	Obsessed by Cruelty Sodom	Mai 1986  Steamhammer	11
	Obsolete Fear Factory	28.07.1998  Roadrunner Records	10
	ObZen Meshuggah	07.03.2008  Nuclear Blast	9
	Oceanborn Nightwish	01.10.1998  Spinefarm Records	10
	Oceanic Isis	17.09.2002  Ipecac Recordings	9
	Octagon Bathory	17.10.1995  Black Mark	11
	Octavarium Dream Theater	07.06.2005  Atlantic Records	8
	October Rust Type O Negative	20.08.1996  Roadrunner Records	15
	Odd Fellows Rest Crowbar	06.07.1998  Mayhem Records	12
	Odin Owns Ye All Einherjer	05.05.1998  Century Media	9
	Odium Morgoth	25.05.1993  Century Media	8
	Of Darkness... Therion	Februar 1991  Deaf Records	8
	Of Frost And War Hail of Bullets	19.05.2008  Metal Blade	12
	Of Lucifer and Lightning Angel Corpse	04.05.2007  Osmose Productions	9
	Of One Blood Shadows Fall	04.04.2000  Century Media	10
	Of Vengeance and Violence Dry Kill Logic	19.09.2006  Repossession Records	13
	Official Live: 101 Proof Pantera	01.08.1997  Elektra Records	16
	On the Seventh Day God Created... Master Master	1991  Nuclear Blast	10
	On The Wings of Inferno Asphyx	27.03.2000  Century Media	9
	Once Nightwish	07.06.2004  Nuclear Blast	11
	Once Sent from the Golden Hall Amon Amarth	12.02.1998  Metal Blade	8
	Once Upon the Cross Deicide	18.04.1995  Roadrunner Records	9
	Once Was Not Cryptopsy	18.10.2005  Century Media	11
	One Kill Wonder The Haunted	17.02.2003  Earache	11
	One Nation Underground Ill Nino	27.09.2005  Roadrunner Records	13
	One Second Paradise Lost	14.07.1997  Music for Nations	13
	Only a Suggestion Hermano	2002  Tee Pee Records	8
	Only Our Death Is Welcome... Krabathor	März 1992  Monitor	10
	Only Theatre of Pain Christian Death	1982  Frontier Records	10
	Onward to Golgotha Incantation	05.05.1992  Relapse Records	10
	Operation: Mindcrime Queensrÿche	03.05.1988  EMI	15
	Operation: Mindcrime II Queensrÿche	04.04.2006  Rhino Entertainment	17
	Opus IV Abigor	29.07.1996  Napalm Records	8
	Opus Magnum Hollenthon	30.05.2008  Napalm Records	8
	Opus Nocturne Marduk	01.12.1994  Osmose Productions	9
	Oracle Kittie	30.10.2001  Artemis Records	11
	Orchid Opeth	15.05.1995  Candlelight Records	7
	Order Maroon	17.04.2009  Century Media	11
	Order of the Leech Napalm Death	22.11.2002  Spitfire	12
	Ordo Ad Chao Mayhem	16.04.2007  Season Of Mist	8
	Organic Hallucinosis Decapitated	07.02.2006  Earache	7
	Orgasmatron Motörhead	09.08.1986  GWR Records	9
	Origin Origin	11.07.2000  Relapse Records	9
	Origin Borknagar	30.10.2006  EMI	9
	Orthodox Krabathor	März 1998  Morbid Records	9
	Osculum Obscenum Hypocrisy	12.10.1993  Nuclear Blast	9
	Out of Exile Audioslave	23.05.2005  Epic Records	12
	Outcast Kreator	22.07.1997  GUN Records	13
	Outcast Ektomorf	27.10.2006  Nuclear Blast	12
	Outpost Fort Europa Panzerchrist	1999  Serious Entertainment	8
	Outside the Gate Killing Joke	Juni 1988  E.G. Records	10
	Overkill Motörhead	24.03.1979  Bronze Records	10
	Overnight Sensation Motörhead	15.10.1996  CMC International	11

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