Amtrak puts a "Magic" piano in a Chicago train station and the rest is history.  The little girl who plays "chopsticks" in the beginning is my favorite (her smile is priceless).  The piano reacts to its surroundings.  So if your in a hurry, the piano may play a faster melody, a little bit curious, it changes its tune, so on and so forth.  Even Santa gets his own soundtrack as he passes the piano.

The guy on his cell needs to chill?  His reaction to the piano had me in tears.