A benefit for the US National Recording Preservation Foundation, this sprawling 2014 New York concert proved a memorable spin-off from the Coen brothers’ Inside Llewyn Davis, with the film’s cast augmented by revolving luminaries such as Jack White, Gillian Welch and Patti Smith. The resulting smorgasbord of Americana finds Joan Baez reviving House of the Rising Sun, Marcus Mumford coming over all Brendan Behan on The Auld Triangle, and White evoking Dave Van Ronk on Did You Hear John Hurt? The mix of camaraderie and musical expertise (the formidable Punch Brothers are house band) is infectious, the celebration of politically tinged folk more joyous than the Coens’ downbeat tale.