Since the launch of the documentary having in the forefront Nirvana's frontman Kurt Cobain, appeared online in several pieces that have never been heard until then. Recently, a new piece has been added to the end of the documentary for its launch in the cinema.
Director Brett Morgen said in an interview last month that he also included a new song in the documentary "Montage of Heck".
Even if he confirmed that another song will surface the director declined to say what scene it can be heard to avoid copying and posting them on the Internet. But even so, a fan recognized the piece and published it online.
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