Is there really any way to innovate FPS games when they've been out so long? Surely any idea you come up with has been used by some obscure game (see Ratchet and Clank reference in the YTMND), so they might as well stick with the tried and true guns.
I like the idea, but I'm pretty sure this song is actually called "Christmas Eve in Sarajevo." If you don't believe me, do a quick YouTube search for this title and listen to the music on whatever comes up.