| Vocalist | Associated bands | Avantasia | The Metal Opera | The Metal Opera Part II | Lost in Space Part I | Lost in Space Part II | The Scarecrow | The Wicked Symphony | Angel of Babylon | The Mystery of Time | Ghostlights | Moonglow | A Paranormal Evening with the Moonflower Society |
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| Tobias Sammet | Edguy | all tracks | all tracks, except track 4 (Malleus Maleficarum) | all tracks | all tracks | all tracks | all tracks | all tracks | all tracks, except track 8 (Symphony of Life) | all tracks | all tracks | all tracks | all tracks |
| Michael Kiske | Helloween, Place Vendome, Kiske/Somerville, Unisonic | Reach Out for the Light | Reach Out for the Light, Breaking Away, Farewell, Avantasia, The Tower | The Seven Angels, No Return | | Promised Land | The Scarecrow, Shelter from the Rain, What Kind of Love | Wastelands, Runaway Train | Stargazers | Where Clock Hands Freeze, Savior in the Clockwork, Dweller in a Dream | Ghostlights, Unchain the Light, Wake up to the Moon | Requiem for a Dream | The Inmost Light, Arabesque |
| David DeFeis | Virgin Steele | Final Sacrifice | Serpents in Paradise, The Tower | The Seven Angels, The Final Sacrifice | | | | | | | | | |
| Andre Matos | ex-Shaman, ex-Angra, ex-Viper, ex-Symfonia | | Inside, Sign of the Cross, The Tower | The Seven Angels, No Return, Chalice of Agony | | | | | Blizzard On a Broken Mirror | | | | |
| Ralf Zdiarstek | | | Malleus Maleficarum, The Glory of Rome | Memory | | | | Black Wings | | | | | |
| Oliver Hartmann | ex-At Vance | | The Glory of Rome, Sign of the Cross, The Tower | The Seven Angels | | | I Don't Believe in Your Love | | Stargazers | | | | |
| Kai Hansen | Helloween, Gamma Ray, Unisonic | | Inside, Sign of the Cross | The Seven Angels, Chalice of Agony | | | | | | | | | |
| Rob Rock | ex-Axel Rudi Pell, ex-Warrior, Driver, Impellitteri | | The Glory of Rome | The Seven Angels, Neverland | | | | | | | | | |
| Sharon den Adel | Within Temptation | | Farewell | Into the Unknown | | | | | | | Isle of Evermore | | |
| Timo Tolkki | ex-Stratovarius, ex-Revolution Renaissance, ex-Symfonia | | The Tower | | | | | | | | | | |
| Bob Catley | Magnum, ex-Hard Rain | | | The Looking Glass, In Quest for | The Story Ain't Over | | Shelter from the Rain, Cry Just a Little | Runaway Train | Journey to Arcadia | The Great Mystery | A Restless Heart and Obsidian Skies, Wake up to the Moon | Lavender | The Moonflower Society |
| Jørn Lande | ex-Ark, ex-Masterplan, lead singer of Jorn | | | | Another Angel Down | Promised Land | The Scarecrow, Another Angel Down, Devil in the Belfry | The Wicked Symphony, Runaway Train, Crestfallen, Forever is a Long Time | Stargazers, Angel of Babylon, Rat Race, Down in the Dark, Alone I Remember, Promised Land | | Let the Storm Descend Upon You, Ghostlights, Lucifer, Wake up to the Moon | Book of Shallows, The Raven Child, The Piper at the Gates of Dawn | I Tame the Storm, Arabesque |
| Amanda Somerville | Aina, Kiske/Somerville, Trillium | | | | Lost in Space, The Story Ain't Over | Lost in Space, Lost in Space | What Kind of Love, Lost in Space | | | | | | |
| Eric Singer | Kiss, ex-Black Sabbath, ex-Alice Cooper | | | | Ride the Sky | | | | | | | | |
| Roy Khan | ex-Conception, ex-Kamelot | | | | | | Twisted Mind | | | | | | |
| Alice Cooper | | | | | | | The Toy Master | | | | | |
| Russell Allen | Symphony X, Adrenaline Mob | | | | | | | The Wicked Symphony, States of Matter | Stargazers, Journey to Arcadia | | | | |
| Tim "Ripper" Owens | ex-Judas Priest, ex-Yngwie Malmsteen, ex-Iced Earth | | | | | | | Scales of Justice | | | | | |
| Klaus Meine | Scorpions | | | | | | | Dying for an Angel | | | | | |
| Cloudy Yang | | | | | | | | | Symphony of Life | Sleepwalking | | | |
| Jon Oliva | Savatage, Jon Oliva's Pain | | | | | | | | Death is Just a Feeling | | | | |
| Joe Lynn Turner | ex-Rainbow, ex-Deep Purple, ex-Yngwie Malmsteen | | | | | | | | | Spectres, The Watchmakers' Dream, Savior in the Clockwork, The Great Mystery | | | |
| Biff Byford | Saxon | | | | | | | | | Black Orchid, Savior in the Clockwork, The Great Mystery | | | |
| Ronnie Atkins | Pretty Maids | | | | | | | | | Invoke The Machine | Let the Storm Descend Upon You, Unchain the Light, Wake up to the Moon | Book of Shallows, Starlight, The Piper at the Gates of Dawn | Paper Plane |
| Eric Martin | Mr. Big | | | | | | | | | What's Left Of Me | | The Piper at the Gates of Dawn, Maniac | Rhyme and Reason |
| Robert Mason | Warrant, Lynch Mob | | | | | | | | | | Let the Storm Descend Upon You, Babylon Vampyres, Wake up to the Moon | | |
| Dee Snider | Twisted Sister | | | | | | | | | | The Haunting | | |
| Herbie Langhans | Seventh Avenue | | | | | | | | | | Draconian Love | | |
| Marko Hietala | Nightwish, Tarot, Northern Kings, Raskasta Joulua, Sapattivuosi, Sinergy | | | | | | | | | | Master of the Pendulum | | |
| Geoff Tate | Operation: Mindcrime, ex-Queensrÿche | | | | | | | | | | Seduction of Decay | Invincible, Alchemy, The Piper at the Gates of Dawn | Scars |
| Candice Night | Blackmore's Night | | | | | | | | | | | Moonglow | |
| Hansi Kürsch | Blind Guardian, Demons & Wizards | | | | | | | | | | | Book of Shallows, The Raven Child | |
| Mille Petrozza | Kreator, ex-Voodoocult | | | | | | | | | | | Book of Shallows | |
| Floor Jansen | Nightwish, Northward, Star One, ex-After Forever, ex-ReVamp | | | | | | | | | | | | Kill the Pain Away, Misplaced Among the Angels |
| Ralf Scheepers | Primal Fear | | | | | | | | | | | | The Wicked Rule the Night |
