Reading and Leeds 2013 – a pair of simultaneous music festivals set to take place in Reading and Leeds, England, from Aug. 23-25 – revealed their initial lineup a few months back, and now, they've announced some key additions. Foals and reunited pop-punkers Fall Out Boy have signed on, and Scottish trio Biffy Clyro -- who recently sat down with for an interview -- will hold it down as headliners.

This will mark Biffy Clyro's first appearance at the acclaimed festivals, and in a recent interview with NME, frontman Simon Neil expressed his excitement.

"Reading always felt like such an exotic festival,” he said. “Even though it’s been around since the '70s, it just really seemed to come alive in the '90s. I think that’s when it became the cultural moment that it is now, and the fixture that it is in the calendar … I still can’t get my head round it."

Other new additions to the bill include System of a Down, Eminem, Sub Focus, Jake Bugg, Deftones, Alt-J, Boy Better Know and Bring Me the Horizon.

Check out the Reading and Leeds festival websites for more details about this year’s events, including info on tickets and accommodations.