Diy Music Box
ThinkGeek has a super-cute DIY Music box kit via NOTCOT.

Music boxes came to prominence in the 19th Century, but their history dates back a few hundred more years. You see, there was this bell ringing dude who got tired of all the hard work. So, he decided to engineer a device to make his life a little more hip. It was a cylinder with metal studs. Each stud (as the cylinder rotated) operated cams which rang the bells. Further research determined that the first song played on this new system was the theme to Super Mario Brothers!