Musician Nick Cave has spoken of the "catastrophic" death of his 15-year-old son and how it has changed him.

The Australian singer speaks for the first time of the death of his son Arthur, who fell from a cliff after taking LSD in July last year, in a documentary trailer.

The film follows the making of Nick Cave and The Bad Seeds 16th album Skeleton Tree and features interviews and footage detailing the singer's struggle with grief.

"Most of us don't want to change, really. I mean, why should we?" Cave says in the black and white trailer.

"But what happens when an event occurs that is so catastrophic that you just change? You change from the known person to an unknown person. So that when you look at yourself in the mirror, you recognise the person that you were, but the person inside the skin is a different person."

Directed by Andrew Dominik, the film entitled 'One More Time With Feeling' will be shown for one night only in cinemas on September 8.

Fans writing on the band's official YouTube channel said the trailer was "heartbreaking".

One fan M Parsons wrote: "For the Bad Seeds to permit us a window into this level of grief is something very special."

Another wrote: "I can't imagine how hard this album must have been to make. So much respect for this man."

An inquest into Arthur Cave's death found he suffered from a fatal brain injury after falling off a 60ft cliff Ovingdean near where he lived with Cave, his mother Susie Bick and twin brother Earl.

A friend told Brighton Coroners Court, the teenager "couldn't tell what was real and what was not real" after they took LSD together shortly before he fell on July 14 last year.