'The Voice' coaches stun fans with beautiful 'Waterfall' performance

Adam Levine, Alicia Keys, Blake Shelton, and Gwen Stefani have released a new cover video to get their fans excited about the upcoming season of The Voice USA.
Performing 'Waterfalls' by TLC, the four judges come together with their guitars, pianos and vocals for a real stripped back cover.
Adam and Blake have been judges on the show since season one. Gwen is returning for her third season while Alicia is returning for her second season.