Informazzjoni minn organizzazzjoni tal-arti (Verifikat minn Operabase)
The Twilight of the Gods by Wagner, Richard, Sib 21 Mar 2009, Minn (2009/2009), Immexxi minn Staffan Valdemar Holm,, Surmast Direttur Gregor Bühl, Leif Segerstam, Kungliga Operan, Stockholm, Sweden