Beethoven's "Moonlight," e.g (6)

I believe the answer is:

sonata

(Other definitions for sonata that I've seen before include "Work for soloist" , "Moonlight, perhaps" , "Musical composition with three or more contrasting movements" , "Composition for 1 or 2 instruments, with 3 or 4 movements" , "Musical composition for a solo instrument" .)

I've seen this clue in the LA Times.

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