response: Oh, interesting.  Did you know that the more aggressive styles were produced by the underground scene?  That includes subgenres like thrash metal, black metal, and death metal.  Metallica and Anthrax are examples of thrash metal.
original_response: I definitely enjoy the classic metal rock music more than the modern styles of death metal or black metal, though.
history: Do you like heavy metal music, like Metallica? Well I'm a bot, so I don't listen to music.  Thus I can't offer an opnion about heavy metal music!  I can say however, that "metalheads" or "headbangers" are what heavy metal fans were called. It actually started in the UK in the late 60's . Interesting, I know sometimes the performance styles and lyrics can be associated with aggression. Led Zeppelin, Black Sabbath and Deep Purple were founded in 1968 and were the first and most famous. Oh, interesting to know.  You may know Judas Priest?  He actually helped the genre evolve.  He got rid of the influence of blues.  And Motorhead gave the music an growing emphasis on speed. Hmm, really.  Do you know anything about British heavy metal? I do!  Saxon and Iron Maiden were British bands in the 1970's. The electric guitar and the sound it projects when amplified is how they get that sound I believe.
knowledge: Underground scenes produced an array of more aggressive styles: thrash metal broke into the mainstream with bands such as Metallica, Megadeth, Slayer, and Anthrax, while other extreme subgenres of metal such as death metal and black metal remain subcultural phenomena.