The show is truly great. Sam Dunn really explains the background and the development of metal music. But I miss episodes that explains death metal, black metal and grindcore. Sure there is some teasers with death metal bands but thats only on the surface of death metal music. You need almost one episode or more to explain death metal. Probably the same with black and grind.
Maybe a season 2 is coming up that explains more sub-genres? let's hope for the best.