Do you enjoy listening to heavy metal music? I am only familiar with a few bands like Metallica. 
Heavy metal is a genre of rock music.  Like it?
I like it in moderation, you have to be in a particular mood to listen to it since it is very loud and fast paced.
It's roots are in blues rock.
That's interesting. I could see that connection with the melody of rock music.
It also has roots in psychedelic/acid rock.
I guess the main guys like Ozzy Osbourne may have been influenced by the blues and psychedelic rock.
I imagine he and Led Zeppelin were.
Yes, definitely Led Zeppelin was heavily influenced by the blues music, their music has been compared to classic blues a lot.
Lots of good stuff from Zeppelin II in 1969