What the musicals "Beggar's Holiday" and "Rent" are based on (6)

I believe the answer is:

operas

(Other definitions for operas that I've seen before include "Musical works" , "The Magic Flute, Don Giovanni etc" , "Tosca and Lucia Di Lammermoor" , "Dramas set to music" , "They're written by 1 across" .)

I've seen this clue in The New York Times.

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