British Folk Band Mumford & Sons Played An Impromptu Duet With U.k. Rock Band The Vaccines During Their Headline Set On The Third Day Of The Open'er Festival In Poland.
The crowd cheered as the bands joined forces to perform Just Smoke from Mumford & Sons' third album Wilder Mind.
U.S. soul singer D'angelo took to the stage after Mumford & Sons followed by Brit band The Prodigy, who closed the main stage with a 90-minute set featuring hits including Breathe and Firestarter.