Music Box Guts!

I want one of these kits so bad. For the last two hours I've been trying to figure out which song of mine I would most like to hear in music box form, and what kind of box I would make for it? which may actually be

Totaly Pointless Machine, Yet Somehow I Feel Like I Need One

Very Cool! Here's a link to the Instructables page, so you can make your own.