This young Swedish folk duo may have one of the lower profiles of the bands on this top 2012 songs list, but don't expect that to last long. 'The Lion's Roar' is First Aid Kit's second album, a collection of a dozen country-flavored indie folk tunes from sisters Johanna and Klara Söderberg that deftly matches an endearing innocence with a level of maturity rare in musicians twice their age (Klara is still a teenager, Johanna is barely in her twenties). 'Emmylou' puts the focus on their gorgeous voices, which harmonize only as soul -- and real -- sisters' voices can.