If you’re of a certain age, Nirvana is your Beatles. They were that transcendent band that comes along once a decade or so. Now, some 20 years after his death, we’re finally getting a documentary worthy of Kurt Cobain’s story. Cobain: Montage of Heck debuts on HBO on May 4th, but here are 2+ minutes of the film that was a massive hit at Sundance. Included are animated pieces, interviews, and plenty of never-before-seen home movie clips. If reports are true, it’s one of the greatest music docs ever made.