Neutral Milk Hotel, Sharon Van Etten and Kurt Vile are also announced for the Welsh event
Beirut has been announced as the first headliner for Green Man Festival 2014.
The singer and multi-instrumentalist, also known as Zach Condon, will headline the main Mountain Stage on Friday (August 15). Other acts announced today are Neutral Milk Hotel, First Aid Kit, Kurt Vile & The Violators, Daughter, Anna Calvi, Sharon Van Etten, Jeffrey Lewis, Tunng and Toy.
In addition, I Break Horses, Ry X, Lanterns on the Lake, Fat White Family, William Tyler, Speedy Ortiz, Georgia Ruth, All We Are, Happyness, Plank!, Eaves, Sons of Noel & Adrian and John Mouse will all play.
Green Man Festival 2014 will take place between August 14-17 on Glanusk Estate, Black Mountains in the Welsh Brecon Beacons.