Did y'all happen to see the Twilight Zone episode entitled "A piano
In The House"?  The bizarre story shows a player piano which changes
a person's character in accordance with the musical style of the roll
played.  As a tune was played for each guest at a party, their
suppressed natures, or alter-egos were revealed honestly.

Do you suppose this plot was gleaned from any real-life experience?

Todd Augsburger - Roller Organs
http://www.rollerorgans.com/

 [ Super!  What songs did the piano play?  -- Robbie