If First Aid Kit's music is proof, Stockholm must be much closer to the American South than any maps have had us believe. In "Emmylou," off January's The Lion's Roar, Swedish sisters Johanna and Klara Söderberg pay perfect homage to a bevy of Americana legends. The song croons, "I'll be your Emmylou and I'll be your June/ If you'll be my Gram and my Johnny, too/ No, I'm not asking much of you/ Just sing, little darling, sing with me." The aesthetics of "Emmylou" are basically classic country, pulling off the lackadaisical pace, beautifully harmonized vocals, and twangy, sunset-lit acoustic guitar with proper doses of panache and sweetness. There's a slender line between derivatively mining nostalgia and making a genuine spiritual throwback, and First Aid Kit is careful enough to accomplish the latter.