Just when they said Heavy Metal was dead, a generation of new bands connected the body to the mains, gave it a 1,000 volts and set it on its feet again. They called it The New Wave of British Heavy Metal - and it has been influencing Rock ever since. Jamie Humphries looks at some of the key metal guitar styles, NWOBHM style guitar riffs, chord progressions and guitar licks, with ideas inspired by Def Leppard, Iron Maiden and Judas Priest in this classic metal guitar lesson.