"La Tétralogie de l'Anneau du Nibelung" by Richard Wagner is a cycle of four epic music dramas composed between 1848 and 1874. Drawing from Germanic and Norse legends, the work follows struggles over a magic ring that grants world domination. The story spans three generations, involving gods, heroes, and mythical creatures, culminating in a final cataclysm. With approximately fifteen hours of music requiring a specially built theatre, Wagner created what many consider opera's most massive undertaking. (This is an automatically generated summary.)