Good list of examples. I like to point people to Every Noise at Once ( http://everynoise.com/engenremap.html http://everynoise.com/engenremap.html ) to show t

Good list of examples. I like to point people to Every Noise at Once ( http://everynoise.com/engenremap.html http://everynoise.com/engenremap.html ) to show the differences between the types of Metal. BTW, it is really really nice to see a post related to this my favourite type of music here in Hacker News. For people that do not understand Metal I can recommend the documentary "Metal, A HeadBanger's journey" ( https://en.wikipedia.org/wiki/Metal:_A_Headbanger's_Journey https://en.wikipedia.org/wiki/Metal:_A_Headbanger's_Journey ) which tries to explain in a "anthropological" way, the background of metal.