Portal - Still Alive on a Music Box
Does black forest cake even taste any good?
The music box can only play in one key, so there's a few awkward notes and no key change.
This is a homemade punch card, and you can buy one of these music boxes at sites like thinkgeek or grand-illusions.
If you want your own music box, check out synthfiend707's tutorial here:
• DIY Music Box Demo & "Christy's Theme"