How many letters does the top answer for “a musical composition for voices and orchestra based on a religious text” have?

The most common answer is cantata (7 letters).

Crossword clue: a musical composition for voices and orchestra based on a religious text

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

cantata 7 letters wn-def

a musical composition for voices and orchestra based on a religious text

oratorio 8 letters wn-def

a musical composition for voices and orchestra based on a religious text