Crossword Genius

The part of a piece of music that must not be omitted (9)

Ross

I believe the answer is:

obbligato

(Other definitions for obbligato that I've seen before include "important passage of music" , "Has to be done" , "vital part of performance?" , "having part to play always" , "Compulsory (music)" .)

I've seen this clue in the Sydney Morning Herald.
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