Holy crap. That is both scary and awesome. I remember when I downloaded Happy Songs for Happy People in 2003 and it ended with what sounded like a looped recording of German children singing playground chants.
Something tells me though that even if this isn’t a hoax, they’re probably not screwing with things like BMSR and Destroyer.
Ha, now that I look, that Mogwai thing is even mentioned on Wikipedia. Ironic that the CD includes software intended for remixing the opening track yourself.