Inspired by Robertson s 2017 bestselling memoir Testimony, ONCE WERE BROTHERS: ROBBIE ROBERTSON AND THE BAND is a confessional, cautionary, and sometimes humorous tale of Robertson's young life and the creation of one of the most enduring groups in the history of popular music. The film blends rare archival footage and interviews with many of Robertson's friends and collaborators, including Bruce Springsteen, Eric Clapton, Van Morrison, Scorsese, Taj Mahal, Peter Gabriel, David Geffen and Ronnie Hawkins, among others.