Matt McCorkle and Sam Reider built an interactive soundboard that plays "Auld Lang Syne" in four-part harmony. The fun comes when you change which instrument plays which part, so you can design or own quartet! Or press the button in the middle to hear the full orchestra. An all-accordion quartet brings up the image of a completely different party than a string quartet. You can even add ambient sounds like people talking or a fireplace. Try it out the New Year's Music Box yourself. -via Laughing Squid