Informazzjoni minn organizzazzjoni tal-arti (Verifikat minn Operabase)
The Valkyrie (reduction) by Wagner, Richard, Ġim 16 Nov 2018, Minn (2018/2018), Immexxi minn Brigitta Gillessen,, Surmast Direttur Rainer Mühlbach, Staatenhaus Köln, Cologne, Germany