PhonoPaper is one of those apps that is useless but so cool that it feels like magic from the future when you're using them: It scans printed sound waves, turning them back into music, messages, or any other kind of sounds as you move your iPhone or iPad across the paper. Watch—and listen:
To use it you only need a computer and a program called Virtual ANS to print the sound waves into paper.
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DISCUSSION
They should make an app that can play music off of actual music (i.e. what a piano player would play), now THAT would be cool! (obviously still not taking the place of true human artists who can put more or less emphasis on a note or change pace, but really cool none the less!)