There's a device called a Makey Makey that can allows you to connect random household objects to a computer with alligator clips, and have them each be considered different buttons. Someone had the brilliant idea to use a Makey Makey to turn their guinea pigs into musicians!
Okay, so it might not be the most amazing song we've ever heard. They may need a little practice. But no musician starts out as Mozart on day 1, right? Keep eating those musical veggies, piggies! We'll buy your album!