Your best bet is to get a copy of the DVD and watch the credits all the way through. At the end of any film’s credits, all the music used in it, whether it was written for the movie or not, is listed by title with who performed it and who wrote it.
I also tried going to the official site for the movie, but it wouldn’t load for some reason. Its possible that the music is listed on the site.
I looked on Amazon and a few other places, but it might be hard to find because it’s a foreign film that wasn’t released widely in the States. Best of luck, though!