Coldplay recenty published a video of the song “Christmas Lights” from a Top Of The Pops 2010 show on their Youtube channel. Between seconds 00:20 – 00:23 the piano keys keep playing even after Chris Martin stands up. Wow! A self-playing piano!
This video explains how the techology behind a self-playing piano works and how to make a piano “talk” using Fourier-Transformation.