Question: From which city in Norway hails the black metal band which played at the Bloodstock Open Air heavy metal festival in Walton-on-Trent?
Sentence (from "Immortal (band)"): The pair worked with various drummers (including Grim, Armagedda and Hellhammer), and were later joined by current drummer Horgh (Reidar Horghagen) in 1996.
Relevant evidence: No