Die Walküre, WWV 86B, is the second of the four music dramas that constitute Richard Wagner's Der Ring des Nibelungen,. It was performed, as a single opera, at the National Theatre Munich on 26 June 1870, and received its first performance as part of the Ring cycle at the Bayreuth Festspielhaus on 14 August 1876.
The above text from the Wikipedia article "Die Walküre" text is available under CC BY-SA 3.0.