All four acts are set to headline the festival, which will take place at its new home on the Lulworth Estate.
The XX Biography
Originally a quartet - Romy Madely Croft, Oliver Sim, Jamie Smith and Baria Quershi - The xx were formed at Elliott School in Putney, a hotbed of creativity that also spawned the bands Hot Chip and The Maccabees.
Their minimalist style taps into classic post-punk style guitars, electronica and dubstep and their demo came to the attention of Radio X's John Kennedy.
Their debut album, xx, was released to universal acclaim in August 2009, but second guitarist Quershi left shortly after its release. The LP won both the Barclaycard Mercury Prize and Radio X's New Music Award in 2010.
Their second album, Coexist, was released in September 2012 and saw the band continue to tour and curate their own set of events called Night And Day in Lisbon, Berlin and London.
The band have announced seven gigs at the O2 Brixton Academy next year.
Romy from The xx has told Radio X her bandmate's kit is gradually filling all the space on stage.
Oliver from The xx has told Radio X the new stuff is sounding good and he's very excited by it
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Look back at the year of The xx, La Roux, Humbug, It's Blitz and Empire Of The Sun.
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