Musical "Jeopardy!" category that's tough for many contestants (5)

I believe the answer is:

opera

(Other definitions for opera that I've seen before include "E.g. Macbeth, Falstaff" , "Billy Budd, for instance" , ""Rigoletto", for example" , "Patience, perhaps" , "10 [NORMA], for example" .)

I've seen this clue in the LA Times.

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