Here's a link from the TED site with a video demonstration of the
technology.  It recreates a performance of Art Tatum through a Yamaha
Disklavier.  It seems to be the ultra modern version of a reproducing
piano in many ways, except that it starts with the recording and works
backward.

http://www.ted.com/talks/john_walker_re_creates_great_performances.html 

Tommy Forney
Shelby, North Carolina