Desc: VH1's Heavy: The Story of Metal: Directed by Michael John Warren. With Rick Allen, Sebastian Bach, Gavin Baddeley, Frankie Banali. The four part documentary focuses on the origins, subgenres, and the bands of heavy metal music, paying close attention to influential bands like Black Sabbath, Led Zeppelin, Judas Priest, and Iron Maiden, who helped to define heavy metal in its early years, including some other bands like Kiss, AC/DC and more.