Dum vocales agunt, nisi aliud statuatur.
- Gamma Ray: Land of the Free – "Farewell" (1995)
- Grave Digger: Tunes of War – tergum vocales in omnibus vestigiis (1996)
- Iron Savior: Iron Savior – "For the World" (1997)
- Nepal: Manifiesto – "Besando La Tierra", "Estadio Chico" (1997)
- Edguy: Vain Glory Opera – "Out of Control", "Vain Glory Opera" (1998)
- Grave Digger: Excalibur – tergum vocales in omnibus vestigiis (1999)
- Therion: Deggial (2000) – "Flesh of the Gods" (2000)
- Rage: Unity – tergum vocales in omnibus vestigiis (2002)
- Angra: Temple of Shadows – "Winds of Destination" (2004)
- Nuclear Blast: Nuclear Blast All-Stars: Into the Light – "Slaves to the Desert" (2007)
- Aneurysm: Shades – "Reflection" (2007)
- Ayreon: 01011001 – proscriptus est aeternus (per crucem celticam symbolo) in "Age of Shadows", "Beneath the Waves", "Newborn Race", "The Fifth Extinction", "Unnatural Selection", "River of Time", "The Sixth Extinction" (2008)
- Dreamtone & Iris Mavraki's Neverland: Reversing Time – "To Lose the Sun" (2008)
- Azeroth: II - tergum vocales in omnibus vestigiis (2008)
- Van Canto: Hero – "Take to the Sky" (2008)
- The Arrow: Lady Nite – "Never Say Never" (2009)
- Rage: Strings to a Web Bonus DVD (Live at Wacken Open Air 2009) – "Set This World on Fire", "All I Want", "Invisible Horizons" (2010)
- Grave Digger: The Ballad of Mary – Rebellion 2010 (2011, EP)
- Grave Digger: The Clans Are Still Marching (2011) – "Rebellion (The Clans Are Marching)" (2011, vivamus album)
- Solar Fragment: In Our Hands – Inside the Circle (2011)
- Maegi: Skies Fall – "Those We've Left Behind" (2013)
- Heaven Shall Burn: Veto – "Valhalla" (2013)
- Iced Earth: Plagues of Babylon – "Among the Living Dead" (2014)
- The Unguided: Fragile Immortality – "Deathwalker" (2014)
- Disforia: The Age of Ether – "The Dying Firmament" (2014)
- Vexillum: Unum – "The Sentenced: Fire and Blood" (2015)
- Doro: Strong and Proud: 30 Years of Rock and Metal – "Rock Till Death" (2016, vivamus album)
- In Extremo: Quid Pro Quo – "Roter Stern" (2016)
- Hansen & Friends: XXX - Three Decades in Metal – "Follow the Sun" (2016)
- The Dwarves OST: "Children of the Smith" (2016)
- Ayreon: The Source – Astronomus in "The Day That the World Breaks Down", "Everybody Dies", "Star of Sirrah", "Run! Apocalypse! Run!", "Aquatic Race", "Into the Ocean", "Planet Y Is Alive!", "Journey to Forever", "The Human Compulsion" (2017)[1]
- Tarja: Feliz Navidad – "Feliz Navidad (Barbuda Relief and Recovery Charity version)" (2017, unius)
- Orphaned Land: Unsung Prophets & Dead Messiahs – "Like Orpheus" (2018)
- Ayreon: Ayreon Universe – The Best of Ayreon Live – "River of Time", "Star of Sirrah", "Age of Shadows", "Everybody Dies", "The Eye of Ra" (2018, vivamus album)
- Judicator: The Last Emperor – "Spiritual Treason" (2018)
- ZiX: Rise from your Ashes your Grave – "Rise from your Ashes your Grave" (2018)
- Avantasia: Moonglow – "Book of Shallows", "The Raven Child" (2019)
- Diamond Kobra: The Arrival – narrator Intro & Outro (2019)
- Hämatom: Maskenball - "I Want It All" (2019)
- Númenor: Draconian Age – "Make the Stand (At the Gates of Erebor)" (2021)
- Corvus Corax: Era Metallum – "Lá í mbealtaine" (2022)
- Stranger Vision: Wasteland – "Wasteland" (2022)
- Powerwolf: Missa Cantorem II - "Call of the Wild" (2022)
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