Unaccompanied part-song for two or more voices — a mad girl (anag) (8)

I believe the answer is:

madrigal

(Other definitions for madrigal that I've seen before include "air" , "glee" , "Unaccompanied song in several parts" , "Elaborate part song" , "Part-song" .)

I've seen this clue in The Guardian.

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