Funny, it loaded up Led for me and Satan's voice? was singing the same melody as Robert. Shouldn't it be backwards as well? I'd add that it wasn't Robert singing backwards anyway, but I'm certain someone would say it was overdubbing of Satan.
Empath asked to listen too. Freddy Mercury sounded normal - that's Freddy singing AOBtD forward and backward. Weird Al probably wrote NTtH like that.
Jeff does say he added sounds to the reversals in Windows.
Fun. I assume it's a joke, then?