First Aid Kit is a Swedish folk duo composed of sisters Johanna (b. 1990) and Klara (b. 1993) SÃ¶derberg, whose close vocal harmonies and woodsy, folk-influenced songwriting take influence from the likes of Fleet Foxes and Joanna Newsom. Hailing from Enskede, a southern suburb of Stockholm, the teenaged siblings began composing songs in 2007. Their 2008 YouTube video cover of the song "Tiger Mountain Peasant Song" by the Fleet Foxes spread their name rapidly on the Internet, the sisters subsequently appeared alongside Fleet Foxes performing the song in a concert in Holland.