How many letters does the top answer for “composer of chapter 27” have?

The most common answer is leto (4 letters).

Crossword clue: composer of chapter 27

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

leto 4 letters wd-fact-v3

wife or mistress of Zeus and mother of Apollo and Artemis in ancient mythology; called Latona in Roman mythology

composer of q18345138 50% similar → mccreary

composer of q19413951 50% similar → nimri

composer of q20856802 50% similar → gosling, hurwitz

composer of q49740 50% similar → raine

composer of q58045522 50% similar → fox