イェンス・ヨハンソン
Some of the guest vocalists and musicians that have been featured on Avantasia are Michael Kiske, Jørn Lande, Alice Cooper, Klaus Meine, Dee Snider, Hansi Kürsch, Jon Oliva, Biff Byford, Joe Lynn Turner, Tim "Ripper" Owens, Geoff Tate, Kai Hansen, Rudolf Schenker, Bruce Kulick, Sascha Paeth, Eric Singer, Eric Martin, Bob Catley, Roy Khan, Russell Allen, Marko Hietala, Henjo Richter, Markus Grosskopf, Timo Tolkki, Jens Johansson, Rob Rock, David DeFeis, Andre Matos, Sharon den Adel, Arjen Anthony Lucassen, Ronnie Atkins, Oliver Hartmann, Candice Night and Amanda Somerville.