The story of the longest surviving and certainly the loudest genre of rock, heavy metal. With no sign of disappearing, metal has been the most controversial and misunderstood of all rock genres. Emerging at the tail end of the hippy dream from the rust belt of industrial England, heavy metal would go on to secure the most loyal fan base of all. With Black Sabbath as the undisputed Godfathers, we follow their highs and lows, and, along the journey, meet Deep Purple, Judas Priest, Iron Maiden and Metallica