Don't you just love the musical score for the film "The Day the Earth Stood Still" (the original version)? And what about "Vertigo"? Or "North by Northwest" and "Mysterious Island" and "Jason and the Argonauts"?
What's interesting is that the same person wrote all those scores -- along with "Psycho," "Taxi Driver" and many more.
What's even MORE interesting, is that the same person also wrote lots and lots of original scores for radio shows -- including Campbell Playhouse, Columbia Workshop, Mercury Theater of the Air, quite a few episodes of Suspense, and many other programs.
Who is that person? Bernard Herrmann, of course.
You can read an interesting NPR blog entry about Herrmann here; and find a list of his movie credits here.