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The libretto also contains sheet music with lyrics. Richard Wagner's tetralogy "The Ring of the Nibelung" (Der Ring des Nibelungen). The Ring of the Nibelungen (German: Der Ring des Nibelungen; Nibelung - "child of the fog") is the title of a cycle of four epic operas based on reconstructions of Germanic mythology, Icelandic sagas and the medieval poem "The Nibelungenlied": Rhine Gold (Das Rheingold), Valkyrie (Die Walküre), Siegfried (Siegfried), Death of the Gods (Götterdämmerung). The libretto and music of the operas were written by Richard Wagner in 1848-1874, that is, in 26 years.