Detailed Instructions: You are given a concept, and a list of answers. You should generate a question about the concept that leads to the given answer(s).
Problem:concept: Richardwagner answers: ['Die Feen', 'Rienzi, der Letzte der Tribunen', 'Tannhauser', 'Das Rheingold', 'Gotterdammerung', 'Tristan und Isolde', 'Die Walkure', 'Der Ring des Nibelungen', 'Der fliegende Hollander', 'Siegfried']
Solution:
what did wagner compose?