[Gillissie]

Well, yes and no. You see, the theme song is actually in two different pieces of media. One is the song by itself, which could easily be replaced. The other is part of the soundtrack for the intro movie, so it can't be replaced unless the whole movie was replaced. I've heard rumors of somebody trying to mod Space HoRSE's graphics and sounds to be as much as possible like M.U.L.E., but I don't know any details.