What does The Day the Earth Stood Still, Hitchcock's Spellbound, and the Beach Boys Good Vibrations have in common? They all use the Theremin, a musical instrument that uses electricity to create music, or in the case of Sci-Fi, unearthly sounds whenever a UFO appears. It's my new favorite musical instrument of the moment.
I'm willing to bet most people will instantly know the sound of the Theremin when they hear it:
A bit dated: