Here's an Instructable from Mikamika explaining how to rip apart an electric toy piano and wire it into a shirt, turning your chest into a playable instrument.
A Toy Piano embedded on a T-shirt. It has 8 keys from Do to Do (1 octave). You can play simple music by wearing the shirt and pushing the fabric button on the shirt. All the components from the toy piano (batteries, speaker, circuit board) are placed on the shirt and connected with poppers. All these hard components are detachable so that you can wash it if you wish.
(via Craft)
