From which city in Norway hails the black metal band which played at the Bloodstock Open Air heavy metal festival in Walton-on-Trent?
Bloodstock Open Air: Bloodstock Open Air is an English heavy metal festival held annually at Catton Hall in Walton-on-Trent, Derbyshire, since 2005. Bloodstock Open Air:  Bands that have played at the festival over the years include Twisted Sister, Saxon, Mastodon, Gojira, Behemoth, Slayer, Anthrax, Cannibal Corpse, Venom, Trivium, Rob Zombie, Emperor, Alice Cooper, Motorhead, Kreator, Blind Guardian, Amon Amarth, Megadeth, Testament, Exodus, Immortal, Morbid Angel, Machine Head, Lamb of God, and hundreds of others.
i don't know