‘Who knew Kurt Cobain was that funny?’

For his new documentary, Cobain: Montage of Heck, Brett Morgen was given unrestricted access to the Nirvana frontman’s archives – and the final edit. Here he talks about the warm, playful side of Cobain the world is about to seeOn the screen, a blond boy blows out his first birthday candle. A minute later he is surrounded by his family at his second birthday party, then his third. We see him dressed as Batman, running up and down a sunlit suburban street. Aged six, he imperiously sits down a