Fearlessly smart, honest and philosophical, Emanuel and the Truth About Fishes is the striking, sometimes breathtakingly beautiful second film from Italian-American writer-director Francesca Gregorini. It marries moments of sweeping surrealism with an earnest, credible exploration of female relationships.

“In a world…” How many times have we heard this portentous introduction to a movie trailer, in a reverberating baritone whose seriousness is in stark contrast to the epic fluff it seeks to promote. Director/writer/star Lake Bell’s oddball and hugely likeable comedy makes up for some of the pain we’ve had to endure through such promos, by taking a peep into the world of the voice-over artists, whose finely-honed vocals are responsible.

On Monday, Pink shocked Twitter followers by announcing she was pulling out of a gig at Birmingham’s LG Arena. A lung infection had confined her to the hotel. “She better get well soon,” said one fan. “I’d die if she cancelled at the O2.” She didn’t, of course. Whether due to an awful lot of oranges or sheer guts she arrived on stage last night, catapulted by giant bungee cords.

Unburdened by conventional narrative sense, Upstream Color is a true curiosity. Seductively strange, woozily kinetic and above all romantic, Shane Carruth's second feature is a little film with big, bizarre ideas. Incorporating pig farming, scientific experimentation and sound recording, it proves that you don't need a sizeable production budget to swoop and soar on the big screen, and that you don't always need to know precisely what's going on to be immersed in a story.

Bringing some much needed sunshine streaming into what has, so far, been a hit and miss spring is this year's Sundance London, which takes place from 25 - 28 April at The O2. Sundance is, of course, a name most associated with Robert Redford, President and Founder of the Sundance Institute which supports fledgling filmmakers and runs the Utah-based festival. This will be the second year the festival has headed on over to bring us the pinnacle of American independent cinema, and this year its US indie gems are accompanied by several sterling UK efforts.

When Justin Bieber finally arrived on stage last night the volume of the screams from the teen audience topped 100 decibels. I know because I measured it on my iPhone. That, however, wasn’t the first deafening noise from the capacity crowd of 20,000. The previous half-hour had been punctuated by a series of boos borne out of growing frustration. Bieber had been scheduled to arrive at 8.30. By 10.25, when the stage lights started to rise, he needed one hell of an entrance.

Elbow are responsible for a remarkable conjuring trick. Earlier this year their song “First Steps” stirringly soundtracked the BBC’s Olympic credit sequence, and then at the Closing Ceremony they serenaded the athletes into the London 2012 stadium with “Open Arms” and “One Day Like This”. Their musical message of harmony and celebration - of higher, faster, stronger, cheerier - ought by rights to sound like the most grating of bromides.

My, my, what a big arena. First ever time I’ve set foot in the O2 Arena. Never before made it down here to view New Labour’s hubris. Another cherry about to be busted involves seeing tonight’s band – I’ve listened to The Rolling Stones for about 40 of my 48 years but never been near a gig of theirs. OK, I once did buy a tout ticket to see Keith Richards at the Town & Country when he toured solo in the early Nineties. And I also caught Charlie Watts’ big band at Ronnie Scott’s a decade ago. Both were great. But the Stones in a stadium? Nah.

Frustratingly, the ramshackle rail service from Brighton deposits me at the crammed O2 20 minutes into Robbie Williams's set. After the eerie quiet of the airport-like walkways around the perimeters, the torrid atmosphere inside the gigantic arena is a shocker. It's packed to the rafters with women shrieking and waving their arms in the air while their men sit beside them, sheepishly mouthing lyrics. Williams, clad fetchingly in black, is playing in the round in the centre of the O2's huge bowl, and the first song I catch is his recent number one single, "Candy".

Muse are not cool. For a minute on leaving the tube station I did think they'd broadened their appeal quite dramatically before realising that a fair section of the people around me were heading to Giants of Lovers Rock show also at the O2 complex last night. But no, their audience, judging by those heading for the main arena, are a fairly even split between hyper-mainstream V Festival demographic and slightly misshapen indie/goth kids, not really much more rock'n'roll in demeanour than, say, a Coldplay crowd, but very dedicated.