Question: Subgenre of heavy metal, Neoclassical metal, was pioneered by an English rock band formed in Hertford in what year?
Sentence (from "Deep Purple"): They were listed in the 1975 "Guinness Book of World Records" as "the globe's loudest band" for a 1972 concert at London's Rainbow Theatre, and have sold over 100 million albums worldwide.
Relevant evidence: No