For more than 50 years, heavy metal has endured. During that time it's topped the charts and languished in cutout bins, mutated into myriad strains, and created as many cultural icons as moral panics. It's taken root on every continent and steadfastly refused to leave. Death Metal, Black Metal, Hair Metal, Thrash or NWOBHM it's all identifiably metal. In this fold-out guide we chart heavy metal's evolution by genre and geography, from its progenitors in the British steel towns to churchburning Norwegians and Australian Christian metallers.