Siri hacked to play piano
9to5mac.com
9to5mac.com
From the original article - "[It] works by streaming a special MIDI version of the music file through an Apple Airport Express and into the Disklavier piano, which then reproduces the piece, complete with key and pedal impressions."
(Like cleverjake pointed out, the music is really made by the Disklavier's controller. Still a fun hack.)
I'd love to be proven wrong, if anyone has related info.