The anticipation is growing ahead of the release of the much-vaunted Kurt Cobain documentary Montage of Heck (trailer HERE), set to air in the US on May 4 on HBO.

It is rumoured that in the documentary there will be a 12-minute long acoustic song by Cobain that has remained unreleased, and just to get us fans frothing at the mouth here’s a snippet.

Rolling Stone Magazine sat down with Frances Bean Cobain, now 22, who opened up about the cathartic process that was the making of the doccie:

What really surprised me was watching my parents’ love story. Because they were so close to my age now…It was like friends falling in love — I did not expect that…

[Frances and Courtney Love] watched Montage of Heck at a private screening room in Burbank, California. It was Love’s first time seeing the documentary, and Frances sat in her lap to help her through the film…

My mother held me, cried on me and just said, ‘I’m so sorry, I’m so sorry, I’m so sorry,” Frances tells us, recalling watching that scene with her mother. “Just kept saying it over and over. But then she said, ‘Do you realize how much your father loved you?’ And I said, ‘Yeah, I do’.

Yeah, it looks like this documentary will be a good’un. The countdown begins…

[source:rollingstone]