The X-Files premiered on Fox in 1993, created by Chris Carter and following FBI agents investigating unexplained cases. Its theme, composed by Mark Snow, became famous for its whistling lead and echoing, minor-key atmosphere, originally inspired in part by The Smiths song How Soon Is Now?. As the show became a pop culture symbol for government cover-ups and alien mysteries, the music escaped the opening credits and spread online as shorthand. Clips, forums and later short-form video turned those few notes into an instant cue that something does not add up.