Green Man have announced that British Sea Power and Eagleowl will join the 2013 line-up.

Eagleowl will play Friday night, whilst British Sea Power join the likes of Ben Howard, Local Natives and Stornoway on the Sunday.

Other acts on the bill include Band of Horses, Kings of Convenience, The Horrors, Swans and Midlake.

The festival takes place at Glanusk Park, Wales, from August 15-18. Grab your tickets by heading here.