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The Lumineers aren't on the new Hunger Games soundtrack, but they did have a hand in the latest film's music. Mockingjay - Part 1 director Francis Lawrence tells AOL he asked the folk rockers to help write the melody for a song star Jennifer Lawrence sings called "The Hanging Tree." 

Francis says he thought the Lumineers would be able to tackle the project because they wrote what he called a "really beautiful song" for the soundtrack to the previous Hunger Games movie, Catching Fire. And the day after he asked them about it, the band sent over a recording of someone whistling the "perfect" tune. 

Lawrence's performance of "The Hanging Tree" is featured on the Mockingjay score album, which arrives in stores this week. The film, meanwhile, topped the box office over the weekend with ticket sales of $123 million! 

Listen to J-Law sing "The Hanging Tree" below! 

Photo: Getty Images