Ever since its noisy birth out of the primitive fuzzboxes of the 1960s, heavy metal music has been maligned and misunderstood by public and critics alike. But, to its millions of fans worldwide, heavy metal is the only form of popular music with any integrity, the true keeper of the eternal flame of rock 'n' roll. This is an exploration of the music in all its aspects, from its origins in the blues to the Black Country and beyond, with the aid of a truly unbeatable line-up including Jimmy Page, Ozzy Osbourne , Led Zeppelin, Black Sabbath, Motorhead, Guns 'n' Roses, Iron Maiden, Deep Purple, Metallica, Megadeth, Slayer, Jimi Hendrix, Kiss, David Lee Roth and Napalm Death. Plus an oblique look at heavy metal's event of the year; Castle Donington, where the fans gather as devotedly as pilgrims to Canterbury.