| Group / Musician | Name Of Release | Year | Credits |
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| A | Avantasia | The Wicked Symphony | 2010 | Vocalist (on track 3) |
| The Wicked Symphony / Angel Of Babylon | 2010 | Vocalist (on CD 1 track 3) |
| V/A -
Metal Hammer: Maximum Metal Vol. 151 | 2010 | Vocalist (on track 3) |
| V/A - NoizeFest Vol. I | 2011 | Vocalist (on track 16) |
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| B | Beyond Fear | Beyond Fear (Demo) | 2005 | vocals, composer |
| Beyond Fear | 2006 | vocals, composer |
| V/A - Convicted In Life (Split) | 2006 | vocals (on track 3) |
| V/A - Hear It! - Volume 24 | 2006 | vocals (on track 8) |
| V/A - Metal Hammer: Maximum Metal Vol. 103 | 2006 | vocals (on track 8) |
| V/A - Rock Hard: Dynamit Vol. 51 | 2006 | vocals (on track 3) |
| V/A - Rock Hard: Rock Guerilla.tv 4 (DVD) | 2006 | interview (on track 20) |
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V/A -
Ryko Distribution CD Sampler 3 | 2006 | vocals (on track 1) |
| V/A - Bang Your Head!!! 2006 (DVD) | 2007 | vocals (on CD1 track 20) |
| V/A - Heroes Of Steel Chapter 4 | 2007 | vocals (on CD2 track 10) |
| V/A - Rock S'cool (Promo) | 2006 | vocals (on track 5) |
| V/A - Rock S'Cool |
2007
| vocals (on CD1 track 9) |
| V/A - Rock S'cool II (DVD) | 2007 | vocals (on track 12) |
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| Brainicide | Brutal Mentality (Demo) | 1990 | vocals |
| V/A - Heavy Artillery. Auburn | 1990 | vocals (on track 16) |
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| C | Charred Walls Of The Damned | Charred Walls Of The Damned | 2010 | vocals |
| Cold Winds On Timeless Days | 2011 | vocals |
| V/A - Rock Hard: Lauschangriff Vol. 1 | 2010 | vocals (on track 4) |
| V/A - Rock Tribune Gratis CD Sampler! | 2011 | vocals (on track 11) |
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| D | DesDemon | Through The Gates | 2011 | vocals (on track 12) |
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| H | Helker | Somewhere In The Circle | 2013 | vocals (on track 4)
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| I | Iced Earth | The Reckoning (Single) | 2003 | Lead Vocals |
| The Glorious Burden | 2004 | Lead Vocals |
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| Gettysburg (1863) (DVD) | 2005 | Lead Vocals |
| Setian Massacre (Single) | 2007 | Lead Vocals |
| Overture Of The Wicked (Single) | 2007 | Lead Vocals |
| Framing Armageddon | 2007 | Vocals |
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| V/A - Setian Massacre (Split) | 2007 | Vocals (on track 1) |
| Festivals Of The Wicked (DVD) | 2011 | Vocals (DVD2 tracks 16-32) |
| 5 Songs (Single) | 2011 | Vocals (on tracks 3-5) |
| V/A - Rock Hard. 20 Years Of Solid Rock! | 2003 | Vocals (on video track) |
| V/A - Festival Sampler |
2004
|
Vocals (on track 3)
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| V/A - Metal Hammer: The Razor Vol. 1 | 2004 | Vocals (on track 11) |
| V/A - Metal Invasion | 2004 | Vocals (on track 1) |
| V/A - Die Nibelungen | 2004 | Vocals (on track 14) |
| V/A - SPV: 20 Years Of Rock N'Roll | 2004 | Vocals (on track 6) |
| V/A - Ich Zahl' Nicht Mehr! - Metal | 2005 | Vocals (on track 3) |
| V/A - Metal Hammer: Maximum Metal Vol. 120 | 2007 | interview (on track 24) |
| V/A - No Sleep 'til September | 2007 | Vocals (on track 4) |
| V/A - Rock Hard: Dynamit Vol. 57 | 2007 | Vocals (on track 1) |
| V/A - Rock S'Cool | 2007 | Vocals (on CD1 track 11) |
| V/A - Rock S'cool (DVD) | 2007 | Vocals (on track 14) |
| V/A - Rock S'cool II (DVD) | 2007 | Vocals (on track 14) |
| V/A - Rock S'cool III (DVD) | 2008 | Vocals (on track 3) |
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| Infinita Symphonia | A Mind's Chronicle | 2011 | vocals (on track 7) |
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| J | Judas Priest |
V/A - Rock S'Cool
| 2007 | Vocals (on CD1 track 6) |
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V/A - Rock S'cool II (DVD)
| 2007 | Vocals (track 18) |
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| M | Michael Schenker | Guitar Master. The Kulick Sessions | 2008 | vocal (on track 6) |
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| Michael Schenker Group | Heavy Hitters | 2005 | vocals (on track 4) |
By Invitation Only
| 2011
| vocals (on track 7)
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S
| Scheepers | Scheepers | 2011 | vocals (on track 2) |
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| Soulspell | Act II: The Labyrinth Of Truths | 2010 | vocals? |
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| Spawn | Round 2 | 1999 | Produced |
| VA - Kickstart My Heart. A Tribute To Motley Crue | 2000 | backing vocals (on track 9) |
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| T | The Claymore | Damnation Reigns | 2010 | vocals (on track 3) |
| V/A - Rock Hard: Lauschangriff Vol. 9 | 2011 | vocals (on track 14) |
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| Tim Ripper Owens | Play My Game | 2009 | vocals, composer |
| VA - Hell Bent Forever: A Tribute To Judas Priest | 2008 | vocals (on track 12) |
| VA - The Broken Law: A Tribute To Judas Priest | 2012 |
vocals (on track 12)
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| T&N | Slave To The Empire |
2012
| vocals (on track 10) |
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| V | Various Artists | Bat Head Soup: A Tribute To Ozzy | 2000 | vocals (on track 1) |
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| One Way Street: Tribute To Aerosmith | 2001 | vocals (on track 3) |
| Numbers From The Beast: An All Star Salute To Iron Maiden | 2005 | vocals (on track 4) |
| Rock Hard: Le Sampler N° 49 | 2005 | vocals (on track 5) |
| This Is Metal |
2005
| vocals (on CD3 track 3) |
| Butchering The Beatles: A Headbashing Tribute | 2006 | vocals (on track 11) |
| The World Greatest Tribute To Ozzy Osbourne | 2006 | vocals (on track 1) |
| '80s Hair Metal Vol.3 - Power Ballads | 2006 | vocals (on CD2 track 7) |
| Roadrunner United: The Concert (DVD) | 2008 | vocals (on track 5, 6, 7) |
| We Wish You A Metal Xmas And A Headbanging New Year | 2008 | vocals (on track 7) |
| The Ultimate Tribute To Ozzy Osbourne | 2009 | vocals (on track 6) |
| Harder and Heavier: '60s British Invasion Goes Metal | 2010 | vocals (on track 6) |
| Ultimate Tribute To Ozzy Osbourne | 2010 | vocals (on track 6) |
| Just Like… A Tribute To Ozzy Osbourne | 2010 |
vocals (on track 6)
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| Sin-Atra | 2011 | vocals (on track 5) |
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| W | Winters Bane | Heart Of A Killer (Demo) | 1991 | vocals |
| Heart Of A Killer | 1993 | vocals, backing vocals |
| VA - Identity 6 | 2000 | vocals (track 12) |
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| Wolfpakk | Wolfpakk | 2011 | vocals (track 10) |
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| Y | Yngwie Malmsteen | High Impact | 2009 | vocals
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| Relentless | 2010 | vocals
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| Yngwie Malmsteen's Rising Force | Perpetual Flame | 2008 | vocals
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