Knowledge: Michael Jackson's unparalleled vocal and dance abilities influenced the way musicians approach performance across genres. Blues and rock played a vital role in the development of heavy metal.

Conversation:
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.
Was the genre influenced by others in any way?

Response: Absolutely! Blues and rock played a pivotal role in shaping heavy metal.