The Swedish folk duo played their current single on the US talk show
Swedish folk duo will play five shows in September
Song is taken from Swedish duo's forthcoming 'Stay Gold'
Swedish duo reveal new song 'My Silver Lining' ahead of June release
The Prime Minister explained "there's a good way" of getting into London's O2 Shepherd's Bush Empire
The folk duo posted their version of song as a 'Christmas gift'
Mumford And Sons are due to draw the Worthy Farm bash to a close tonight (June 30)
Folk duo will take their new album 'The Lion's Roar' around the UK in November