What is the main theme to the X-Files called?

Question

The song is the main theme to the X - Files. It is a beautifully whistled theme. If anyone can give me a steady answer ... you will get BEST ANSWER! (the first person to give me an accurate title)

Answer 1

Whistle it for me.  It's called the Main Theme or "Suicide Is Painless".

Answer 2

Hey ... try the X files

Answer 3

"Materia Primoris". The composer is Mark Snow.

Nick Cave and P.M. Dawn recorded their own versions of it for the "Songs In The Key Of X" album, which also includes the original Mark Snow version. Each of the two movies has its own slightly different version of the theme as well.