Rufus and Martha Wainwright closed Sundance London with an intimate performance.
The singing siblings dropped their set following the world premiere of Sing Me The Songs That Say I Love You - A Concert For Kate McGarrigle, Lian Lunson's documentary film about the music of their mother, folk singer Kate McGarrigle.
Rufus, who has released his new album Out Of The Game, couldn't resist making a joke about the wet weather, saying: "We could be in Utah: the weather is so s***."
Robert Redford, president and founder of Sundance Institute, said: "Sundance London marked our first time hosting an event in the UK, and we are grateful to all our supporters and collaborators for the reception we received. These four days have seen features, documentaries and live events with insightful filmmakers and musicians, as well as passionate audiences in attendance."
Fourteen films and eight short movies made their UK premieres at the first-ever Sundance London music and film festival, including Josh Radnor's Liberal Arts, Lauren Greenfield's The Queen Of Versailles and The House I Live In by Eugene Jarecki.
Prince Charles gave the event the royal seal of approval when he introduced documentary Harmony, which he narrated and is a call to combat climate change and the global environmental crisis.
Other musicians who performed at the four-day-long festival, which ran at O2 London from April 26 until 29, included Tricky and Martina Topley-Bird, who reunited to perform the album Maxinquaye, and Placebo.