Götterdämmerung, the fourth of Richard Wagner's four Ring operas. The cast features Manfred Jung as Siegfried and Gwyneth Jones as Brünnhilde, with music provided by Bayreuther Festspiele Orchester conducted by Pierre Boulez. This title is available in a boxed set with the other Ring operas, Das Rheingold, Die Walküre, and Siegfried.