Killing Joke are an English post-punk group which formed in October 1978 in Notting Hill, London, England. Founding members Jaz Coleman (vocals, keyboards) and Geordie Walker (guitars) have been the only constant members. A key influence on industrial rock, their early music was described by critics Stephen Thomas Erlewine and John Dougan as well as industrial metal and "quasi-metal, dancing to a tune of doom and gloom," which gradually evolved over the years