William Close returned to The World's Best stage with his Earth Harp for a medley with a beautiful twist on The White Stripes' Seven Nation Army.

Tonight the World's Best on CBS will feature the Battle Round with William Close & his Earth Harp going up against Naturally 7.

Tune in next Wednesday, Feb 13th at 8 pm ET/PT to The World's Best on CBS to watch William Close's performance with The Earth Harp.