Splinter Cell Double Agent Easter Egg - Hidden song

Tested only on XBOX and PS2 so far. Start first mission (Iceland) and go to the control room of the plant (this is a room where you have a view outside on a communication tower) near the end of the mission. Switch on and off the light switch more than 60 times. Go back (you don't have the choice anyway) and continue the mission. When you reach the garage door where you have to type a code, this will stop the music and start a hidden song.
Sweet :)