Justin Bieber has made a habit out of serenading unsuspecting guests, whether that be a bar in the O.C. or in a hotel lobby with Selena Gomez in L.A. Last night, Bieber once again slid up to a piano in the lobby of the Montage Beverly Hills and performed for hotel guests. This time, he put his classical music skills to the test and played Beethoven’s “Für Elise.”  Keep the lobby performances coming, Bieber.