Wagner's Mature Music-Dramas (Tristan and Isolde, The Mastersingers of Nuremberg, and Parsifal) in Light of Their Allegorical Relationship to The Ring of the Nibelung
Prequel to The Ring of the Nibelung: How Wagner's Three Canonical Operas (The Flying Dutchman, Tannhäuser, and Lohengrin) Paved the Way to his Mature Music Dramas