'Kurt Cobain: Montage of Heck' Soundtrack to Feature Unreleased Track

Courtesy of Sundance International Film Festival
'Kurt Cobain: Montage of Heck'

Director Brett Morgen teased on Twitter that a "mind blowing 12 minute acoustic" song would be on the album.

The upcoming soundtrack for the documentary Kurt Cobain: Montage of Heck not only will offer insights into the late Nirvana frontman's life, but its soundtrack also will feature an unreleased track from Cobain.

The film's director, Brett Morgen, shared the news on Twitter. "Listening to a mind blowing 12 minute acoustic Cobain unheard track that will be heard on the montage of heck soundtrack," he wrote on social media. The news originally was reported by Loudwire.

The film will make its television premiere May 4 on HBO. Billboard spoke to Morgen earlier this year about the upcoming release, which he worked on over a span of eight years.

"It's as intimate as you can get," he said. "People have projected fantasies on the limited amount of things that came out between 1991 and 1994 [from Cobain]. I have a great degree of confidence the more you get to know him, the more you'll love him."

This story first appeared on billboard.com.