This melody was covered by several different singers, including R.E.M. The two girls who sing a song, called First Aid Kit and they are the folk singers. Suppose they do not believe in themselves and do not know any cool stage movements, but they sing from the heart and fully investing themselves out. Excellent sound for the song of the genre of folk pop, which makes you smile and feel that the most important thing in the world is you and your actions.
Reference: Exclusive: Watch First Aid Kit Perform 'Walk Unafraid' with R.E.M.'s Peter Buck From 'Wild'Billboard