What do you think about heavy metal music?
I like it.  You can't go wrong with the aggressive style of Metallica
I don't think I have ever really listened to it.  Is it alot of screaming involved?
Not a lot of screaming, but it's a fast temop and agreesive style.  
more heavy on the instrumental side then?
Not a lot of screaming, but it's loud and intense
so metallica is your favorite band from that genre?
Yes, of that genre.  I like grunge too.  SOundgarden was good