The Avett Brothers surprised Bonnaroo when they showed up unannounced at the Ed Helms-hosted bluegrass superjam. They joined the musician and actor onstage to play “Be Kind To A Man When He’s Down,” a standard from the 1920s.
Videos by American Songwriter
Watch them rehearse the song backstage:
And check out their performance later that evening:
As a bonus, here’s Sarah Jarosz and company running through a cover of Gnarls Barkley’s crazy from the same Superjam.