The critically-acclaimed film was made with the full cooperation of Cobain's widow Courtney Love and features intimate and troubling scenes of the Nirvana icon as he battled his addictions in the run-up to his suicide.

Morgen tells Deadline he discovered "hours upon hours of never before heard Cobain music" as he trawled through archive recordings while making the documentary. He adds: "I could not possibly understand how this existed and nobody had encountered it before."