HBO were dubious about airing Beyonce's documentary film.

The TV network were finally persuaded to broadcast the singer's tell-all documentary 'Life Is But A Dream' after six weeks of cajoling from her management team, but the film has now topped their ''must have'' list.

Michael Lombardo, HBO's President of Programming, told the Daily News: ''I have no clue why this works. If someone said to me, 'Why is this on HBO?' I can't say why -- this isn't a traditional documentary and this isn't a traditional music special because there something undeniably moving and honest about it.''

He admitted the network were initially sceptical about airing the singer's pet project - which she produced and directed as well as starred in - because they usually only take critically acclaimed documentaries and blockbuster music specials.

Michael confessed: ''I knew who Beyonce was, but I wasn't really a fan. If you had asked me to name more than one of her songs at that point I couldn't.''

However, after six weeks of negotiations, her management team found a time and date to sit down with him and watch the film, which the TV boss says blew him away.

He acknowledged: ''This, felt so fresh and honest to me. She's constantly walking this line between public performer and private person, and wrestling with how, in this massive spotlight, she can hold onto the part of yourself that makes you real.

''It's such an honest struggle and such an honest conversation. I was also dazzled by how hard she works, the unbelievable, unsexy, hard, sweaty work that goes into mounting a show - any show she does. You just have to take you hat off to her.''