Heavy metal is a genre of rock music which emerged in 1960s in the United States and United Kingdom partly inspired by psychedelic rock, blues and acid rock.
Lyrics of heavy metal genre and its styles are associated with machismo and aggression.
It was greatly found in the music of Jimi Hendrix, Jimmy Page, Eric Clapton etc. Kinks' "You Really Got Me" became a source of inspiration for the development of heavy metal, loud and distorted sound.
I mean the possibility of getting head injuries from any sport is pretty big and from contact sports its bigger but its still rare and as long as you follow rules and your equipment is up to date everything should be fine.
