If you haven’t seen someone playing the piano backwards before, take a good look at this video.

A brother and sister are seen battling it out on the piano in this clever clip, first nudging each other out of the way then rotating around on their stool.

Jason and Sarah Black perform a mash-up of Frozen songs including Love is an Open Door, For the First Time in Forever, Do You Want to Build a Snowman and Let it Go.

via Frozen Fever: Brother and sister play Frozen songs on the piano while sitting backwards | Metro News.