The album, which will be released with the DVD package in November (15), features the previously unreleased music in the documentary and a handful of additional tracks recorded by the singer/songwriter.

And Morgen reveals the as-yet-untitled album will include "audio montages that Kurt Cobain created" and "a sketch comedy routine featuring Kurt voicing all of the characters".

Morgen compiled the album while researching Montage of Heck, which will hit U.S. cinemas on Friday (07Aug15).

He says, "(The album presents) a lighter portrait of Kurt than one might expect. You really get a sense of how happy he was simply by creating himself. His lyrics are really playful, and, at times, you can feel his smile and warmth coming through."

Meanwhile, Morgen has revealed his interview with Cobain's former bandmate Dave Grohl, which was recorded after he completed work on the documentary, will not feature on the DVD release.

He adds, "I don't think Dave Grohl is a DVD extra. I think it would be disrespectful."