Sonisphere has added four more act this week. Feeder, Frank Turner, Skindred and
Taking Back Sunday are the latest to join the bill for the UK leg of the festival which travels around Europe this summer.
Metallica and Linkin Park will headline at Knebworth over the weekend of August 1-2, with other acts including Machine Head, Mastodon, Alice in Chains and Bullet for my Valentine.
Tickets are on sale now.