Amtrak and those at Rob Bliss Creative discovered the key to bringing some Christmas cheer to Chicago’s Union Station.

Christened the “Magical Piano,” the piano appears to play on its own as various bystanders approach the ivory keys with mixed emotions — some perturbed by the tunes while others are enchanted enough to take a seat and play for those watching and snapping videos.

Watch 2 minutes and 35 seconds into the video and you will see an elderly gentleman with a harmonica performing a duet with the magical piano. Watch a little more and you’ll see the piano begin to play “Deck the Halls” as a man dressed as Santa Claus approaches the piano.

The video, posted to YouTube Wednesday, has more than 2 million views.

WATCH

[youtube=http://www.youtube.com/watch?v=D9BOTXFCpQA&w=560&h=315]