Justin Bieber is a classic pianist and he whipped out his skills in a hotel lobby.
This video of Justin is equivalent of you playing piano in your living room, since it went down in the bar at the fancy Bev Hills hotel where Justin lives.
But check out JB tickling 'em. There's a very proud piano teacher somewhere in Canada.
BTW, it's Beethoven's "Für Elise." But, you knew that.