DIY, dark arts and chartbusters pepper this idiosyncratic story of the Joke’s four-decade careerShaun Pettigrew’s exhaustive account of Killing Joke’s four-decade career is really a fans-only job, although it gradually loosens the cloak of mystique drawn around this band’s shoulders. Possibly spooked by frontman Jaz Coleman’s thousand-yard stare, Pettigrew takes his subjects’ dabbling in the darker arts seriously, devoting entire sidebars to runes and numerology.