Is Justin Timberlake, who had a small part as a folk music troubadour in the movie Inside Llewyn Davis, trying to brink folkie back? During a private show at New York's Hammerstein Ballroom last week, JT grabbed an acoustic guitar and performed "Jolene" by current folk-rocker Ray LaMontagne. Justin hasn't been playing the song during his 20/20 Experience tour, so maybe it was being in New York, home to the fictional Llewyn Davis, that inspired him to return to troubadour mode.