some of the greatest heavy metal bands include black sabbath, led zeppelin, iron maiden, ac/dc, anthrax, metallica, kiss, motley crue, and alice cooper
a form of hard rock that began with black sabbath, led zeppelin and purple haze in the late 1960s and early 70s
"some of the greatest heavy metal bands include black sabbath, led zeppelin, iron maiden, ac/dc, anthrax, metallica, kiss, motley crue, and alice cooper" What is the definition of "heavy metal"?