First Aid Kit are a Swedish duo comprised of sisters Johanna and Klara Söderberg, whose vocal harmonies and woodsy, folk-influenced songwriting take influence from the likes of Fleet Foxes and Joanna Newsom. Hailing from suburban Enskede, the siblings began composing songs as young teenagers in 2007. The home-recorded "Tangerine" enjoyed airplay on Swedish radio later that summer, and the debut EP Drunken Trees helped expand the girls' audience upon its release in April 2008. The London-based Wichita Records reissued Drunken Trees one year later, bolstering its track list with a reverent Fleet Foxes cover and three additional songs performed live in a Swedish forest. The duo then set to work on a full-length album, balancing schoolwork with the recording sessions.

The Big Black & the Blue was released in 2010, followed by Lion's Roar in early 2012.