A previously unheard demo by Nirvana frontman Kurt Cobain has been added to the theatrical re-release of director Brett Morgen’s documentary “Kurt Cobain: Montage Of Heck.”
Billboard reports the film’s return to theaters on August 7 will see the soundtrack include the untitled song, which features Cobain singing in a falsetto.
The period of the demo’s recording is unknown because it was pulled from an unmarked cassette, but Morgen says there's some evidence that Cobain recorded it in 1991 because it appears on a tape "on which he was also working on 'Old Age,'" which was written during the “Nevermind” sessions.
Morgen says he inserted the new song without altering the cut of the movie that played on HBO, which has since been nominated for seven Emmys.
He declined to divulge where the track appears "because I don't want to get people out there bootlegging it on their cell phones."
Cobain’s daughter, Frances Bean, served as executive producer on the project alongside Morgen as the pair worked on the definitive biography of the late Nirvana frontman.
VIDEO: Nirvana play living room concert in Montage Of Heck preview
Preview unreleased Kurt Cobain song from Montage Of Heck
VIDEO: Kurt Cobain Montage Of Heck documentary preview
Nirvana: Kurt Cobain documentary to premiere in US theaters
Search Nirvana at hennemusic