An essential part in a musical score (9)

I believe the answer is:

obbligato

(Other definitions for obbligato that I've seen before include "Musical accompaniment" , "Musical part not to be omitted" , "Essential part of a piece of music" , "Instrumental part not to be omitted" , "Instrumental part integral to a piece of music - I go to blab (anag)" .)

I've seen this clue in The Independent.

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