Nirvana fans, pay heed. The trailer for the documentary you've been waiting for is finally out. Kurt Cobain: Montage of Heck, chronicles the life of the Nirvana frontman, from his childhood days to his brush with fame in the early 90s, when Nirvana broke out into the grunge scene and his problems with attracting too much attention. But the film also covers that side of Cobain that only close friends and family have seen. The documentary is directed by Brett Morgen and Cobain's daughter, Frances Bean Cobain serves as the executive producer. Here's the trailer.