Der Ring des Nibelungen (The Ring of the Nibelung), WWV 86, is a cycle of four German-language epic music dramas composed by Richard Wagner. The works are based loosely on characters from the Norse sagas and the Nibelungenlied. It is often referred to as the Ring Cycle, Wagner's Ring, or simply The Ring. Wagner wrote the libretto and music over the course of about twenty-six years, from 1848 to 1874. The four parts that constitute the Ring cycle are, in sequence, Das Rheingold (The Rhinegold), Die Walküre (The Valkyrie), Siegfried and finally, Götterdämmerung (Twilight of the Gods). This production, featuring the Aarhus Symphony Orchestra and the Den Jyske Operas Kor conducted by Francesco Cristofoli was recorded live on September 6, 1987.