I love heavy metal music, I like alot of bands like Ozzy and AC DC, do you know about heavy metal music? 
I'm a total metalhead so yeah I know about it. It's a genre of rock music from the late 60's and early 70's which started mostly in the United Kingdom.
Thats cool, Never knew it started in the UK, What were some of the first heavy metal bands anyways? 
Well, in 1968 the most famous founders of heavy metal were Led Zeppelin, Black Sabbath and Deep Purple, especially Black Sabbath. I remember when I first heard Black Sabbath, I loved it.
Heck yeah those guys are legends and the best out there, What was the most sold heavy metal album? It had to be AC DC or metallica. 
So in the mid 1970's, Judas Priest did a lot for the development of the genre. It did away with the blues influence and Motorhead drew on punk rock a lot and an emphasis on speed.
Yeah Judas Priest was awesome, What was his best best selling album? 
I'm honestly not sure which one sold best. In the late 70's, the new wave of British heavy metal got going, with bands like Iron Maiden and Saxon.