Twilight Zone (music by Marius Constant)

This TV theme by French avant-garde composer, Marius Constant, has become one of the most famous in TV history and has also been used in the movie versions of the series. It was was not used for the TV series until the second season. The first season's theme was written by the legendary film composer, Bernard Herrmann (Vertigo, Psycho, The Day the Earth Stood Still, North by Northwest, Obsession, Taxi Driver, etc.). Apparently the producers preferred Constant's more catchy theme. Actually the theme was patched together from two cues of Constant's library music, which studios often purchased from composers to use (or "track") whenever they needed to use stock music material. The rest is history.