How many letters does the top answer for “composer of boogie nights” have?

The most common answer is wahlberg (8 letters).

Crossword clue: composer of boogie nights

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

wahlberg 8 letters wd-fact-v3

author of boogie nights 50% similar → reynolds

composer of night and day 50% similar → porter

director of boogie nights 50% similar → cheadle, hartley, reynolds

wrote boogie nights 50% similar → reynolds