The Scott Rosenbaum-directed film features interviews with the trio, along with their final live performance together before their deaths in 2011 - including footage of Perkins and Smith's Grammy win for Best Traditional Blues Album in February the same year.

And Rosenbaum reveals the seeds for the documentary were sown while shooting his previous film The Perfect Age Of Rock 'N' Roll. The director exclusively tells TeamRock: "We had a scene where the main characters, Jason Ritter and Kevin Zegers, happened upon an old joint while on their journey along Route 66.