10. Regarded as one of Richard Wagner's masterpieces, it is a series of four long works based loosely on characters from Norse sagas. The work described is

Answer: E

Explanation:

Der Ring des Nibelungen

This work is a series of four operas composed by Richard Wagner that are collectively known as "Der Ring des Nibelungen." It is inspired by characters and themes from Norse mythology and sagas, making it one of Wagner's most significant contributions to the operatic repertoire.

A) Norma

"Norma" is an opera by Vincenzo Bellini, not Richard Wagner. It focuses on a Druid priestess and her tumultuous relationship but does not relate to Norse sagas or consist of a series of four works, making it incorrect in this context.

B) Rienzi

"Rienzi" is an opera by Wagner, but it is a standalone work based on the historical figure Cola di Rienzi, rather than a series of operas. It does not involve Norse characters or sagas, which disqualifies it as the correct answer.

C) Tristan und Isolde

"Tristan und Isolde" is another famous opera by Wagner, renowned for its intricate themes of love and death. However, it is a single opera and does not encompass the Norse sagas or the multi-part structure that characterizes "Der Ring des Nibelungen."

D) Der Rosenkavalier

"Der Rosenkavalier" is an opera composed by Richard Strauss, not Wagner. This opera is set in 18th-century Vienna and focuses on themes of love and social class, which are not related to the Norse sagas depicted in Wagner's work, making it incorrect.

E) Der Ring des Nibelungen

This option is indeed the correct answer as it refers to Wagner's monumental cycle of four operas: "Die Walküre," "Siegfried," "Götterdämmerung," and "Das Rheingold." These operas are intertwined and based on Norse mythology, fulfilling the criteria outlined in the question.

Conclusion

"Der Ring des Nibelungen" is definitively the correct answer as it is the only option that represents a series of four operas by Richard Wagner inspired by Norse sagas. All other options either belong to different composers, are standalone works, or do not relate to the thematic elements of Norse mythology, which is central to the question.