The two musical acts have been added to the opening night of Sundance London, which kicks off on April 26.
Brit nominated pop band The Guillemots and Oscar winning musician/actor Glen Hansard will be performing at the opening night of Sundance London on April 26.
They will join Robert Redford and T Bone Burnett who will be kicking off the first Sundance London film and music festival at the O2 arena in London.
Hansard, who won the 2007 Oscar for Best Original Song for his indie film Once, said: “The Sundance Film Festival was the springboard for Once and all its subsequent success. We will be forever grateful to Sundance for seeing the potential in our film when no other film festival did.”