The trailer for the upcoming Kurt Cobain: Montage of Heck documentary offers a brief preview of what looks to be an extremely important rock 'n' roll film. The doc, the first made with the cooperation of the Cobain family, features previously unreleased music and artwork by the man who reluctantly gave a voice to an entire generation. Family, friends and bandmates like Nirvana's Krist Novoselic were interviewed for the film, directed by Brett Morgen.

In the clip below, viewers are offered a glimpse at a young Kurt Cobain thanks to home movies provided by his family. A lullaby version of "All Apologies" plays as the toddler version of the singer introduces himself. The frame shifts over to animated scenes of a teenage Kurt as a narrator reads lines from the artist's journal.

"I don't know how anybody deals with having your whole family reject you," one person said.

Friends and family go on to talk about his artistry as footage from Nirvana's heyday is shown. Eventually the trailer gets to the final days of Kurt's life as he tries to figure out how to balance fame, fortune and new family responsibilities with his then-baby Frances Bean, who was an executive producer on the doc. Check out the emotional video below and do not miss the Montage of Heck premiere May 4 on HBO.

"I started work on this project eight years ago. Like most people, when I started, I figured there would be limited amounts of fresh material to unearth," Morgen said about the doc prior to its inclusion in the Sundance Film Festival. "However, once I stepped into Kurt's archive, I discovered over 200 hours of unreleased music and audio, a vast array of art projects -- oil paintings, sculptures -- countless hours of never-before-seen home movies, and over 4,000 pages of writings that together help paint an intimate portrait of an artist who rarely revealed himself to the media."

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