The festival takes place in Madrid between 8th and 11th July, and had already confirmed names including Billie Eilish, The Killers, Wolf Alice, Charli XCX and Taylor Swift.
Other acts appearing across the weekend include Marika Hackman, Beabadoobee, Phoebe Bridgers, Pale Waves, Easy Life and Arlo Parks.
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The dates come ahead of their sets at Reading & Leeds.
Marcus and pals headline on 1st June.
The Japanese House, You Me At Six and Ten Tonnes have also joined the bill.