"The X-Files" is an instrumental written and produced by American film and television composer Mark Snow. On its parent album, The Truth and the Light: Music from the X-Files, the track is titled "Materia Primoris". It is a remixed version of the original theme Snow composed for the science fiction television series The X-Files in 1993. The composition was released as a single in 1996 and achieved chart success, particularly in France, where it reached number one on the singles chart. The composition has since been covered by many artists, including DJ Dado and Triple X; DJ Dado's version was a major hit in Europe while Triple X's version reached number two in Australia.