An Emmy Award-winning filmmaker has collaborated with Bruce Springsteen on a new documentary that chronicles the recording of the Boss' 1978 album. The film, “The Promise: The Making of Darkness on the Edge of Town,” will premiere Sept. 14 at the Toronto International Film Festival. Filmmaker Thom Zimny gained access to never-before-seen footage of rehearsals and recording sessions shot from 1976-78. At the time, Springsteen was working to move past years of legal trouble and match the success he had with “Born to Run.” “The Darkness” album featured many songs recorded with a full band immediately after being written. Tracks covered the plight of average Americans, from the struggling everyday hero in “Badlands” to hopelessness in the title track.