The Swedish duo,First Aid Kit, are sisters Johanna and Klara Söderberg. Who are both very young. I got their CD a while back and I loved it. Their cover of Fleet Foxes'-Tiger Mountain Peasant Song is really good. I had an obsession with fleet foxes for a while so this cover is nice to hear.
MP3:First Aid Kit-Tiger Mountain Peasant Song(Fleet Foxes Cover)
MP3:First Aid Kit-You're Not Coming Home Tonight