Actually, I probably need to make myself a bit clearer. I want to use one of the other pieces that are already a part of F:NV, but I'm having trouble working out how to actually make use of the PlayMusic command in the first place. The end result I want is to permanently change the piece of music that plays in one location to a different piece from the F:NV soundtrack. I can find the music ID codes in GECK (I think) but beyond that I'm not sure exactly how to go about this.