In 1994, when Kurt Cobain died at the age of 27, he left behind a treasury of unreleased music . More than 20 years later, fans around the world will finally be able to listen to Cobain's lost recordings.

Director Brett Morgen, who filmed "Kurt Cobain: Montage of Heck ," an intimate documentary about the singer's life, said he found Cobain's stash of rare, unreleased music stored in boxes.

"I opened up another box and there were 107 cassettes featuring over 200 hours of never-before-heard or rarely heard music," said Morgen in an interview with Bedford + Bowery . "I mean I would lean heavily of the never-before-heard, probably 95 percent."

On the official soundtrack for the documentary, called "Montage of Heck: The Home Recordings ," one will finally be able to listen to (and own) Cobain's earlier recordings.

"I curated the album to create a feeling that the listener was sitting in Kurt's apartment in Olympia, Washington, in the late '80s, and bearing witness to his creation," said Morgen in an interview with Rolling Stone.

The soundtrack will be released by Universal on Nov. 13. For now, listen to Cobain's cover of The Beatles' "And I Love Her":

After that, listen to this early demo of Nirvana's "Sappy," which will also be featured on the album:

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