Once Were Brothers details the rise of five-piece Candian-American group the Band from their beginnings backing rockabilly great Ronnie Hawkins and electrifying folk music with Bob Dylan in the mid-60s, to coming into their own by the end of the decade—and shaping the past half century of roots rock in the process. As its full title suggests, it’s told primarily from the point of view of cofounder and lead songwriter Robbie Robertson, who proves to be an exquisite storyteller. Archival footage and interviews with Hawkins and Robertson’s ex-wife Dominique Robertson add depth and sometimes humor. But the film feels increasingly one-sided as it turns to the Band’s slow unraveling and split following their 1976 farewell concert (documented by Once Were Brothers’s executive producer Martin Scorsese in 1978’s The Last Waltz). That makes sense considering that it’s largely based on Robertson’s 2016 book, Testimony, but it paints an incomplete picture; while Robertson contends that the Band intended on reuniting eventually, only “everyone forgot,” he sidesteps the group’s second act without him through the 80s and 90s. As a memoir brought to film, Once Were Brothers shines bright, but anyone looking for a well-rounded look at the Band should take it as one piece of the puzzle.