The WABOT-2, developed by Waseda University in back in the 1980s was a humanoid robotic keyboard player that was actually considered the most advanced robot of its time. It could listen to accompanying singers and change its tempo while carrying on a conversation. Check out the video for some of its keyboard-playing prowess.
Humanoid History - WABOT, [via]
http://blog.makezine.com/archive/2008/04/robot_from_the_past_plays.html