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Kurt Cobain with his infant daughter, Frances Bean Cobain. Illustrates TV-STUEVER (category e), by Hank Stuever © 2015, The Washington Post. Moved Friday, May 1, 2015. (MUST CREDIT: The End of Music LLC/Courtesy of HBO.) Image Credit: THE WASHINGTON POST

Although there were rumours that he was planing a solo album before his death more than 21 years ago, Kurt Cobain’s recorded output amounts to little more than three incendiary albums as frontman of Nirvana. However, the director of Montage of Heck, the new documentary about Cobain, says that this could soon change.

Brett Morgen, who combed through more than 200 hours of Cobain’s home recordings when researching his film, has compiled an album’s worth of “unreleased gems” to be released this summer. He told US publication Bedford + Bowery that the “amazing” record “will feel like you’re kind of hanging out with Kurt Cobain on a hot summer day in Olympia, Washington, as he fiddles about. It’s going to really surprise people.

“Just to be clear, it’s not a Nirvana album, it’s just Kurt and you’re going to hear him do things you never expected to come out of him.” The tapes include a rough recording of Cobain covering the Beatles’ And I Love Her, which was distributed on the web last month.

Montage of Heck will be broadcast on HBO in the US on 4 May.