How many letters does the top answer for “a part of the score that must be performed without change or omission” have?

The most common answer is obbligato (9 letters).

Crossword clue: a part of the score that must be performed without change or omission

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

obbligato 9 letters wn-def

a part of the score that must be performed without change or omission

obligato 8 letters wn-def

a part of the score that must be performed without change or omission