This song, "Tiger Mountain Peasant Song", is performed by two teenagers (15 and 17) from Sweden, who go by the name of First Aid Kit. Apparently it is a cover of a tune by a band called The Fleet Foxes. I had never heard of either of these groups, but yet again Zefrank came through with his "Collection of amazing music you may have missed" feed on BuzzFeed.
I'm now addicted to both of these groups, especially these young Swedes. There is something so pure about those voices....like they were made to do just that: Sit in a forest with a guitar and sing to the world.