Bloodstock Open Air is a British heavy metal festival held annually at  Catton Hall in  Walton on Trent,  Derbyshire, since 2005. Bands that have played at the festival over the years include  Twisted Sister,  Saxon,  Mastodon,  Behemoth,  Slayer,  Anthrax,  Cannibal Corpse,  Venom,  Trivium,  Rob Zombie,  Re Vamp,  Emperor,  Alice Cooper,  Motorhead,  Kreator,  Blind Guardian,  Amon Amarth,  Megadeth,  Testament,  Exodus,  Nightwish,  Immortal,  Morbid Angel,  Machine Head,  Lamb of God, and hundreds of others. More @ Wikipedia