Beethoven's "Ah! perfido," for one (4)

I believe the answer is:

aria

(Other definitions for aria that I've seen before include "Song, one from 'West Side Story' needing no introduction" , "Operatic solo performance" , "Opera solo" , "Elaborate accompanied song for solo voice" , "Operatic song" .)

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

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