Although it's already been through the festival circuit and saw an HBO release as well as a short-lived theatrical run, the Brett Morgen-directed Kurt Cobain documentary Montage of Heck will get a theatrical re-release on Aug. 7. This time around, fans will be able to hear an unreleased Cobain song that Morgen carefully inserted into the film without re-editing.

In an interview with Billboard, Morgen refrained from detailing the exact spot the song can be heard. "I don't want to get people out there bootlegging it on their cell phones," he said. The untitled track was pulled from one demo cassette of hundreds that Morgen sifted through in order to find unearthed Cobain gems — this particular finding showcases Cobain's falsetto and difficult to understand lyrics that could be "wonder how I breathe" and "I'm a bad man." Morgen infers that the track was recorded around 1991.

Morgen detailed Cobain's talent for mixing his recordings, which made for perfect cinematic additions to the movie theater release. "Kurt played around with sound collage, particularly with [stereo] effects," he said. "And it's a sensory experience that really envelops you."

In May, the filmmaker spoke of big plans to release a Montage of Heck album, including a "treasure chest" of original and unreleased Cobain material. "It's great material that should be out there in the world," he told KCRW. "I finished the film and there was all this other music. No one asked me to do anything, I just started cutting the thing together and telling the estate that they should put this out." A release date has yet to be divulged.

The latest Cobain documentary Soaked in Bleach takes a conspiracy theorist approach, placing the blame of the Nirvana front man's death on his widow, Courtney Love. Overall, the documentary that saw full support from Courtney Love and Frances Bean Cobain has garnered wide-spread praise, unless you're the Melvins front man Buzz Osborne.

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