Brett Morgen's documentary "Kurt Cobain: Montage of Heck," will focus on the late Nirvana frontman's life and art, not his death by suicide in 1994. Pictured: Cobain performing in 1992. Reuters

Director Brett Morgen has almost completed an HBO documentary on the life of Kurt Cobain slated for next year, reports Variety. The first fully authorized biography of Nirvana's frontman, who committed suicide in 1994, "Kurt Cobain: Montage of Heck" will feature the best of over "200 hours of unreleased music and audio" he was given access to by Cobain's family.

Although Cobain's wife, Courtney Love, participated when Morgen first began researching the documentary in 2006, her participation has been described as minimal. Cobain's daughter, Frances Bean, is the film's executive producer.

Unlike Nick Broomfield's 1998 doc "Kurt and Courtney" and Gus Van Sant's 2005 drama "Last Days," both of which focused on Cobain's suicide -- with the Broomfield doc even offering conspiracy theories about Cobain's murder -- Morgen promises "Montage of Heck" will focus on Cobain as an artist.

“He worked in just about every medium," Morgen told Variety, including Super-8 movies, spoken word poetry, sculpture and photography. "These pieces show a world view that no one has seen, and all this material has been sitting in storage boxes for all these years. I’m thrilled we’re going to be able to share it with the world.”

Morgen directed the 2012 Rolling Stones documentary "Crossfire Hurricane" and the 2002 doc "The Kid Stays in the Picture," which looked at the life of Hollywood super-producer Robert Evans.

The title "Montage of Heck" comes from an unreleased mixtape Cobain made in 1988 that combined his music with other artists' including Kiss, Sammy Davis Jr., and "outsider" musician Daniel Johnston.

Morgen said his primary aim is to "challenge the existing mythologies surrounding Kurt and present a very humanistic portrait of one of the great creative artists of our time.”