08-06-11: Jax2While "Psycho" is clearly not within the thread's boundaries, it brings to mind another Hitchcock film scored by Bernard Herrmann that does fit, the 1956 version of "The Man Who Knew Too Much." The section entitled "Music" in this Wikipedia writeup on the film has some interesting information, including the fact that Mr. Herrmann was the orchestral conductor during the film's lengthy climactic (although not concluding) scene.
... I didn't really want to eliminate films where music was a plot element, yet was not necessarily the central theme.
Best regards,
-- Al