Dubstep supergroup Magnetic Man is the latest act to be confirmed for South West Four Weekender, held at London's Clapham Common from 27-28 August.
The trio are set to play on the main stage on Sunday (28 August), warming the crowd for headliners Pendulum.
Underworld are set to headline on Saturday (27 August), with more acts to be announced.
Producer Skream, one third of Magnetic Man, said: “SW4 is an important gig for us! It’s on our home turf, the atmosphere is always incredible and we can get a taxi home at the end. We can’t wait to tear it up in front of our friends and family.”
Tickets are available now at £85 for weekend admission.
Magnetic Man are one of Virtual Festivals’ Ones to Watch in 2011.