They join The Strokes, Arctic Monkeys and Primal Scream for the four-day bash which will be held from July 14-17.
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Portishead also recently confirmed plans to curate a two-day All Tomorrow's Parties event in July 2011. They will perform alongside Factory Floor, DOOM, Swans, Liars, Beach House and Company Flow, who will play with their original line-up and for the first time in the UK for 10 years.
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