From The Sky Down opened at the Toronto International Film Festival tonight with hundreds of fans turning up as Bono, Edge and director Davis Guggenheim walked the red carpet.

'Did anyone tell you this was a documentary?' joked the director, before thanking Paul McGuinness, Brian Celler and U2's management team for their commitment to the project.

Davis welcomed Michael Brook, the composer and J Cassidy, editor of the movie, before introducing 'Mr The Edge and Mr The Bono.'

'We're very protective of our privacy and particularly of our creative process,' explained Bono. 'There's an old saying, 'If you knew what went into the sausage you wouldn't eat it..
'The only way we were going to do this was if we could find a director who was as curious about the creative process... we couldn't get Wim Wenders!' he added,  to wide applause.

Bono described Davis' enjoyment of esoteric subject matter: 'I mean - who could make a feature length film on guitar players?' (It Might Get Loud, in 2009,  starred Jimmy Page, Jack White and The Edge.)

Edge spoke about Michael Brook and Danny Lanois, describing how shocking it was to look back twenty years 'and see how close our band came to disintegrating.'

'If it was left up to us - it might have had a lot more jokes and a lot more asides. But what Davis has done is remarkable - hope you enjoy the film.'

Here's Bono, talking to reporters, about 'waiting for the muse to arrive' and in a BBC report talking about how 'we ended all that people loved about our band.'