We’ve heard Kristian and Amanda Hollingby Matsson duet before, namely live onstage for the Tallest Man on Earth’s “Thrown Right At Me” and for an intimate cover tune on Swedish television. But this collaboration is a little different: “Heart is Like a River” finds the pair co-writing an original on their first film soundtrack project, setting respective stage names aside for Once A Year (En gång om året in Swedish). Featuring 7 compositions from the Matssons, director Gorki Glaser-Müller’s romantic drama about a couple’s annual trysts over 30 years opens Friday night in Sweden with an international (and hopeful OST release) forthcoming. With thanks to producer Kristofer Henell, we’ve got the premiere of this lovely recording above.