Who composed tetralogy "The Ring of the Nibelung"?
Johann Sebastian Bach
Wolfgang Amadeus Mozart
Franz Joseph Haydn
Richard Wagner
The Ring of the Nibelung,  is a cycle of four German-language epic music dramas composed by Richard Wagner. The works are based loosely on characters from the Norse sagas and the Nibelungenlied. Wagner wrote the libretto and music over the course of about twenty-six years, from 1848 to 1874. 
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Johann Sebastian Bach
Wolfgang Amadeus Mozart
Franz Joseph Haydn
Richard Wagner
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