A documentary that goes behind the scenes with some of today's most talented songwriters as they make new music based on long-lost, newly discovered lyrics from Bob Dylan's legendary Basement Tapes sessions. T Bone Burnett brings Elvis Costello, Rhiannon Giddens, Taylor Goldsmith, Jim James and Marcus Mumford together in a dramatic two-week studio session in the basement of Capitol Records. Features an exclusive interview with Bob Dylan.