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Composer (2011) Rocked & Ripped by Bulletboys |
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Group Member, Composer, Vocals (2011) Rev-Raptor by U.D.O. |
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Vocals, Group Member (2011) Leatherhead by U.D.O. |
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Composer (2011) Surtur Rising by Amon Amarth |
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Vocals (2011) World as We Love It by Pushking |
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Composer (2009) Dominator by U.D.O. |
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Vocals, Lyricist, Composer (2009) Dominator by U.D.O. |
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Vocals, Group Member (2008) Mastercutor: Alive by U.D.O. |
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Composer (2008) Decade of the Moon by Concerto Moon |
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Producer, Composer, Vocals (2007) Metallized: The Best of U.D.O. by U.D.O. |
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Group Member, Vocals (2007) Mastercutor [Bonus Tracks] by U.D.O. |
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Group Member, Vocals (2007) Mastercutor by U.D.O. |
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Guest Appearance (2006) Arockalypse [Special Edition] by Lordi |
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Vocals (2006) Hellforces by Majesty |
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Vocals (2005) Mission No. X by U.D.O. |
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Composer, Vocals (2005) Mission No.X by U.D.O. |
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Vocals (2005) Classic Diamonds by Doro |
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Guest Appearance (2005) Classic Diamonds [DVD] by Doro & The Classic Night Orchestra |
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Composer (2004) Best of Accept by Accept |
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Composer, Vocals (2004) Thunderball by U.D.O. |
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Composer (2004) Wretched Spawn/Worm Infested by Cannibal Corpse |
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Group Member, Vocals (2003) Nailed to Metal: The Missing Tracks by U.D.O. |
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Vocals, Group Member (2003) Nailed to Metal: The Missing Tracks/The Complete History [DVD/CD] by U.D.O. |
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Composer (2003) Worm Infested [EP] by Cannibal Corpse |
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Composer, Vocals (2003) Accept/Restless & Wild by Accept |
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Vocals, Producer (2002) Man and Machine by U.D.O. |
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Vocals, Composer (2001) Live from Russia by U.D.O. |
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Composer (2000) Take Two by Accept & Quiet Riot |
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Vocals, Producer (2000) Holy by U.D.O. |
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Producer, Composer, Vocals (1999) No Limits by U.D.O. |
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Compilation (1999) Best of U.D.O. by U.D.O. |
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Vocals (Background) (1999) I Want Out by Hammerfall & Kai Hansen |
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Vocals (1998) All Areas - Worldwide by Accept |
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Vocals (1998) Final Chapter by Accept |
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Vocals (1997) Animal House by U.D.O. |
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Vocals (Background), Vocals (1997) Faceless World by U.D.O. |
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Composer, Vocals (1997) Mean Machine by U.D.O. |
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Vocals (1997) Mean Machine by U.D.O. |
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Producer, Composer (1997) Solid by U.D.O. |
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Vocals (1997) Predator by Accept |
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Composer (1995) Hungry Years by Accept |
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Composer (1995) Stigmata [Bonus Tracks] by Tarot |
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Vocals (1993) Objection Overruled by Accept |
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Composer (1992) Trapped! by Rage |
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Vocals (1991) Time Bomb by U.D.O. |
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Composer (1990) Staying a Life by Accept |
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Composer (1986) Restless and Wild/Balls to the Wall by Accept |
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Composer (1986) Kaizoku-Ban: Live In Japan by Accept |
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Vocals, Group Member (1986) Russian Roulette [Bonus Tracks] by Accept |
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Vocals, Vocals (Background) (1985) Metal Heart by Accept |
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Finger Snaps, Vocals, Vocal Harmony, Vocals (Background), Group Member (1985) Metal Heart [Bonus Tracks] by Accept |
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Vocals (1984) Balls to the Wall by Accept |
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Vocals, Group Member, Performer, Author (1983) Restless & Wild by Accept |
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Producer (1983) All for One by Raven |
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Composer (1983) Restless and Best by Accept |
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Performer (1983) All for One [Expanded] by Raven |
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Vocals (1983) Restless & Wild by Accept |
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Composer, Vocals (1981) Breaker by Accept |
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Composer, Vocals (1981) Breaker by Accept |
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Vocals, Liner Notes, Group Member (1980) I'm a Rebel by Accept |
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Vocals (1980) I'm a Rebel by Accept |
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Liner Notes, Group Member, Vocals (1979) Accept by Accept |
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Vocals (1979) Accept by Accept |
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Vocals (1979) Accept by Accept |