Task: Explanation
Input (English): Cardillac is an opera by Paul Hindemith in three acts and four scenes. wrote the libretto based on characters from the short story "Das Fräulein von Scuderi" by E.T.A. Hoffmann. Question: Sadko has written and Cardillac by Hindemith is an example of operas written in which style? Answer: libretto
Output (English):  wrote the libretto based on characters from the short story Das Fräulein von Scuderi by E.T.A. Hoffmann.