Informazzjoni minn organizzazzjoni tal-arti (Verifikat minn Operabase)
Siegfried by Wagner, Richard, Tli 05 Mej 2009, Minn (2009/2009), Immexxi minn Francesca Zambello,, Surmast Direttur Heinz Fricke, John F. Kennedy Center for the Performing Arts, Washington D.C., United States