Radiohead frontman Thom Yorke has been announced as one of the main acts for this year's Big Chill Festival, joining MIA and Massive Attack on the Deer Park Stage this summer.

Other previously announced acts for the 40,000-capacity festival include Kruder & Dorfmeister, Kelis, Roots Manuva and Plan B.

Festival Republic, which is majority owned by Live Nation, acquired the Big Chill at the end of last year, after previous owners Chillfest Limited was placed into voluntary liquidation in 2009.

The Big Chill is held at Eastnor Castle Deer Park, Herefordshire, from August 5-8. The event will also feature the Tate Britain's Rude Britannia as apart of its arts program.

In related news, those who purchased full-priced tickets through Ticketline to the Glade Festival (Billboard.biz, May 12) can now swap their tickets for a weekend ticket to the Big Chill. The Glade Festival 2010 was recently canceled due to what organizers called an "unexpected forced increase in security and police costs as well as a level of advanced ticket sales below expectations."