Yes, it's "Der Ring des Nibelungen" (singular, only one Nibelung), not "Der Ring der Nibelungen" (plural). ;-) A good introduction to Richard Wagner's opera cycle consisting of "Das Rheingold", "Die Walküre", "Siegfried" and "Götterdämmerung" can be found on Wikipedia in several languages, see the link in the shoutbox. And you can also read the complete libretti of these operas on several web sites if you have problems to understand the singers.
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