Richard Wagner Ring des Nibelungen opera cycle performed 2007-2009 at the Valencia Palau de les Arts Reina Sofia and published by C Major. Save money by buying all the Valencia Ring operas in a boxed set. The box includes the four titles described in more detail on this site at Das Rheingold, Die Walküre, Siegfried, and Götterdämmerung. The artwork you see at the left is found on the front cover of the box and comes from the Das Rheingold. See individual titles for grades. My blended grade for the box set is "C+."