Okay, I use to have this song (at least 5 years old) but can't remember the name of it. It is during the dinner/cocktail party and there is a guy singing, almost reggae like but not quite. Sorry, no words that I remember.
Found a clip with part of the song in there. Kinda quiet, but if you rewind the video back to the beginning you can hear it louder for some reason.
Fracture Movie Video Clip "Call Me Later"