Because computer software has MIDI files in text form, you can't record vocals etc to make a new one.
BUT MIDI files, though low quality, can be compiled with different instrumental parts to play a song (sometimes used in polyphonic ringtones).
So now we're thinking audio is a possibility again!

http://todbot.com/blog/2006/10/29/spooky-arduino-projects-4-and-musical-arduino/
We might just be able to get this audio working yet ... either with the sketch above or using ardrumo; piezo senser's can be used as the trigger to play the different audio tracks. Just need to write a MIDI file with the desired audio; apparently straight forward!
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