How do YOU define heavy metal? Is it a sound? Is it a look? Is it a lifestyle? Is it all of the above, or something altogether different?

October is Metal Month at Radio.com, and throughout the month we'll see artist interviews, plus mini-documentaries about metal, metal fans and the birthplace of metal.

In one mini-documentary, the site sat down an all-star group of metal superstars - including Dave Mustaine, Rob Halford and Phil Anselmo - the above questions and more in search of the answer to the question: "What is metal?"