Assertion: classical music's opera | /r/HasProperty | the magic flute
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Source sentences:
text: Mozart is perhaps best known for his opera, The Magic Flute, although most people also recognize Eine Kleine Nachtmusik, as well as a number of his symphonies and concertos.
text: Well known operas are Mozart's Magic Flute, Bizet's Carmen, Wagner's Ring cycle (a huge set of four operas) and Puccini's Madame Butterfly.