The X-Files premiered in 1993, created by Chris Carter, following FBI agents Mulder and Scully investigating paranormal cases. Composer Mark Snow wrote the main theme, famous for its echoing piano, synthesized strings and distinctive whistling lead inspired partly by chance studio effects. As the series became a cultural phenomenon through the 1990s, the short intro became shorthand far beyond the show itself. It spread through TV parodies, remixes and internet memes, and is now routinely placed under footage that feels eerie, secretive or too strange to explain.