Pierre Boulez (conductor) Pierre Boulez (composer) Sort by: alphabetical | popularity | playlist Wagner, Richard - Opera `Parsifal` (1857-82), WWV 111 Wagner, Richard - Tetralogy `Der Ring des Nibelungen.` Part I: Prologue - Opera `Das Rheingold` (1851-54), WWV 86a Wagner, Richard - Tetralogy `Der Ring des Nibelungen.` Part II: Opera `Die Walküre`, WWV 86b Wagner, Richard - Tetralogy `Der Ring des Nibelungen.` Part III: Opera `Siegfried` (1851-71), WWV 86c Wagner, Richard - Tetralogy `Der Ring des Nibelungen.` Part IV: Opera `Götterdämmerung` (1848-74), WWV 86d