| Énekes | Album, amin szerepelt | Szerepe |
| Andi Deris (Helloween) | Universal Migrator Part 2: Flight of the Migrator | |
| Anneke van Giersbergen (The Gathering) | Into the Electric Castle | Egyiptomi |
| Ayreonauts Only | - |
| Astrid van der Veen (theEndorphins) | Ayreonauts Only | - |
| Fate of a Dreamer (Ambeon) | – |
| Axel Joseph Langemeijer (ex-Bodine) | III · Three Times Running (Bodine) | – |
| Barry Hay (Golden Earring) | The Final Experiment | – |
| Bruce Dickinson (Iron Maiden) | Universal Migrator Part 2: Flight of the Migrator | – |
| Damian Wilson (ex-Rick Wakeman, Threshold (UK), Landmarq) | Into the Electric Castle | Lovag |
| Universal Migrator Part 1: The Dream Sequencer | – |
| Ayreonauts Only | - |
| Dan Swanö (Nightingale, Edge of Sanity, ex-Bloodbath (Swe)) | Space Metal (Star One) | – |
| Dave Brock (Hawkwind) | Space Metal (Star One) | – |
| Debby Schreuder | The Final Experiment | – |
| Devin Townsend (Strapping Young Lad, The Devin Townsend Band) | The Human Equation | Düh |
| Devon Graves (Dead Soul Tribe, Psychotic Waltz) | The Human Equation | Gyötrelem |
| Edward Reekers (ex-Kayak) | Into the Electric Castle | Jövőbeli |
| Universal Migrator Part 1: The Dream Sequencer | – |
| The Final Experiment | - |
| Actual Fantasy | - |
| Ayreonauts Only | - |
| Edwin Balogh (ex-Omega) | Into the Electric Castle | Római |
| Eric Clayton (Saviour Machine) | The Human Equation | Ok |
| Erik Norlander | Universal Migrator Part 1: The Dream Sequencer | – |
| Universal Migrator Part 2: Flight of the Migrator | – |
| Fabio Lione (Rhapsody of Fire) | Universal Migrator Part 2: Flight of the Migrator | – |
| Fish (Fish, ex-Marillion) | Into the Electric Castle | Hegylakó |
| Floor Jansen (ReVamp, After Forever, Northward, Nigthwish) | Universal Migrator Part 1: The Dream Sequencer | – |
| Gary Hughes (Ten) | Ayreonauts Only | – |
| George Oosthoek (Orphanage) | Into the Electric Castle | Halál |
| Hansi Kürsch (Blind Guardian) | 01011001, The Source, Universe | – |
| Heather Findlay (Mostly Autumn) | The Human Equation | Szerelem |
| Ian Parry (Elegy) | Universal Migrator Part 2: Flight of the Migrator | – |
| The Final Experiment | - |
| Ayreonauts Only | - |
| Irene Jansen (ex-Karma) | The Human Equation | Szenvedély |
| Jacqueline Govaert (Krezip) | Universal Migrator Part 1: The Dream Sequencer | – |
| James LaBrie (Dream Theater) | The Human Equation | Én |
| Jan-Chris de Koeijer (Gorefest) | The Final Experiment | – |
| Jay van Feggelen (ex-Bodine) | Into the Electric Castle | Barbár |
| The Final Experiment | - |
| Johan Edlund (Tiamat, Lucyfire) | Universal Migrator Part 1: The Dream Sequencer | – |
| Lana Lane | Universal Migrator Part 1: The Dream Sequencer | – |
| Universal Migrator Part 2: Flight of the Migrator | – |
| Lenny Wolf (Kingdom Come) | The Final Experiment | – |
| Leon Goewie (Vengeance (Neth)) | The Final Experiment | – |
| Ayreonauts Only | - |
| Lucie Hillen | The Final Experiment | – |
| Magnus Ekwall (The Quill) | The Human Equation | Büszkeség |
| Marcela Bovio (ex-Hydra, Elfonía, Stream of Passion) | The Human Equation | Feleség |
| Mark McCrite (Rocket Scientists) | Universal Migrator Part 1: The Dream Sequencer | - |
| Mikael Akerfeldt (Opeth, ex-Bloodbath (Swe)) | The Human Equation | Félelem |
| Mike Baker (Shadow Gallery) | The Human Equation | Apa |
| Mirjam van Doorn | The Final Experiment | – |
| Mouse (Tuesday Child) | Universal Migrator Part 1: The Dream Sequencer | – |
| Ayreonauts Only | - |
| Neal Morse (ex-Spock's Beard) | Universal Migrator Part 1: The Dream Sequencer | Az első ember |
| Okkie Huysdens | Actual Fantasy | – |
| Peter Daltrey (ex-Kaleidoscope) | Into the Electric Castle | Forever of the Stars |
| Ralf Scheepers (Primal Fear) | Universal Migrator Part 2: Flight of the Migrator | – |
| Robert Soeterboek (Wicked Sensation) | Universal Migrator Part 2: Flight of the Migrator | – |
| The Final Experiment | - |
| Actual Fantasy | - |
| Ayreonauts Only | - |
| Robert Westerholt (Within Temptation) | Into the Electric Castle | Halál |
| Russell Allen (Symphony X) | Universal Migrator Part 2: Flight of the Migrator | – |
| Ruud Houweling (Cloudmachine) | The Final Experiment | – |
| Sharon den Adel (Within Temptation) | Into the Electric Castle | Indián |
| Simone Simons (Epica) | 01011001 | – |
| Timo Kotipelto (Stratovarius) | Universal Migrator Part 2: Flight of the Migrator | – |
Könnyűzenei portál • összefoglaló, színes tartalomajánló lap
