HBO has agreed to air Brett Morgen's documentary on Nirvana frontman Kurt Cobain, reports TIME.

Since Cobain's death in 1994, there have been many books and films about the 27-year-old singer, including documentaries like 1998's "Kurt & Courtney."

Morgen believes his documentary "Kurt Cobain: Montage of Heck" will show Cobain fans the man was much more than the face of Nirvana. He has worked on the documentary for over five years to ensure an accurate depiction of the singer and songwriter.

"The thing about him people might not know too is that he was an incredible visual artist and left behind a treasure chest of comic books, paintings, Super 8 films, all sorts," Morgen told Fact magazine in 2013. "We are going to do the movie sort of like a third-person autobiography, as if Kurt was around and making a film about his life."

Morgen has described Cobain as a contradiction-someone who "could be sincere and sentimental, and also ironic and sarcastic. He was sweet and sour. He was incredibly funny too, and the film has to reflect his spirit."

Cobain's family gave Morgen's film crew complete access to the singer's personal and family artifacts, including journals, home movies and demos. Morgen uncovered 4,000 pages of writings, 200 hours of unreleased audio and music, as well as art in the form of sculpture and oil paintings.

"Kurt Cobain: Montage of Heck" gets its title from Cobain's experimental mixtape made in 1988. The 36-minute recording blends his original music with audio from other people's records, such as Kiss leading into Daniel Johnston. The mixtape has never been leaked or officially released.

The Guardian reports that Frances Bean Cobain, Cobain and Courtney Love's daughter, is producing the documentary.

The film will debut on HBO in 2015.