The Sundance Film Festival is opening in Utah, with a programme including the world premiere of a documentary movie on the Glastonbury music festival.
Some 120 films from 30 countries will be shown at the 10-day festival founded by actor Robert Redford in 1981.
It will be opened by US movie Friends with Money, starring Jennifer Aniston.
"This year, it's a festival that feels more independent, that feels less mainstream," festival director Geoffrey Gilmore said.
In previous years Sundance has been accused of becoming increasingly commercial as firms use it to showcase products.
However, this year's line-up includes a number of message-driven documentaries and films.
Ground Truth: After the Killing Ends and Iraq in Fragments are among the 16 movies in the US documentary competition.
Other screenings in that competition include American Blackout, an exploration of voting troubles in recent presidential elections.
Nicole Holofcener's Friends With Money opens the festival
Malcolm Ingram's Small Town Gay Bar shows alongside An Inconvenient Truth, profiling former US vice president Al Gore's crusade against global warming.
Meanwhile, consumer advocate Ralph Nader is revealed to audiences in An Unreasonable Man.
Grbavica, a Bosnia-Herzegovina movie about the aftermath of the conflict in the former Yugoslavia, is also on the list.
Glastonbury chronicles the evolution of the Somerset event with footage from every single Glastonbury festival.
Directed by The Filth and the Fury film-maker Julian Temple, the film will appear in Sundance festival's world documentary competition.
The gay family cruise that former chat show host Rosie O'Donnell organised with her partner Kelli O'Donnell is brought to the big screen in All Aboard! Rosie's Family Cruise.
"I hope it just opens people's hearts," O'Donnell told Reuters. "You know, the way to get to people is through their hearts."
Sundance has showcased a number of hits in recent years such as Maria Full Of Grace and In the Bedroom.
Unveiling the festival line-up in December, Mr Gilmore stressed that the event would not have a commercial focus.
"It's a festival that very much kind of underscores for me what independent film-making is," he said.
"It's an independent film-making that is not going to be mistaken by anybody for films that come out of Hollywood."