I really like the tones this DIY pipe organ is able to produce. I would love to see this adapted to an Arduino or other micro-controller so it could play by itself. Then again, I would like to see almost anything automated with a micro-controller! Hopefully this will eventually be turned into a full instructable in the near future.

A homemade choir organ and pedalboard with a compass of one chromatic octave (C 4′ to 2′). Built during Christmas break, this organ first became remotely playable on Christmas morning, 2008; it formally debuted that night when it was used to accompany Christmas carols.

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The Best of Instructables Volume I