One of Terry Teachout's readers asks a simple question, "Is there any classic Hollywood comedy from the golden age with a great or even near-great musical score?" Adolph Deutsch's score to Some Like It Hot (1959) is in the near-great category, at minimum, but I'll allow that the best music is in the actual musical numbers, which weren't by Deutsch. And a special award should go to Woody Allen, for putting together a hilarious all-Prokofiev score to Love and Death (1975).
Alex Ross goes to bat for Beetlejuice; Lisa Hirsch for Carl Stalling and Looney Tunes.