What is the song in the very beginning of "Somebody's Watching" in season 1? I've looked at many websites but they all had different songs, none of them worked. :(

The song is called "Hollywood Swinging" By Kool & The Gang featuring Jamiroquai.

If you want to know more music from Criminal Minds then you should take a look here:
link

Hope this helped!

It's Hollywood Swinging, but they use a different track for the DVD version. For some reason they changed the song on the DVD version