Country music has become a free-trade zone: Witness "Emmylou," a love song about Gram Parsons and Emmylou Harris, sung by two Swedes with old-school sibling-act harmonies. Johanna and Klara Söderberg are indie rockers at heart: They recorded this set in Omaha with Bright Eyes' Mike Mogis; Conor Oberst does his own Gram Parsons turn on "King of the World." The songs shuffle styles, but the voices transcend genre distinctions – you may not hear a more beautifully sung record this year.

Listen to "Emmylou":

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• Photos: Random Notes