There have been plenty of films and pensées about superstars whose grasp on fame slipped away (for whatever reason) as well as the hangers-on and groupies who loved them. But what about those barn burners who never quite made it? The director of American Hardcore delves into the lives of eight very different singer-songwriters from the 1960s, ’70s, and ’80s who had high-profile producers (like John Lennon) or relationships with stars (like T. Rex), didn’t become famous, but still continue to make music today. A fantastic mixtape with a lot of heart, Rachman’s film is a long overdue corrective for these significant talents.