Heavy music is often relegated to the dark corners of the listening populous, where Satan is said to live. Yes, there was a string of murders and suicides by members of a Norwegian black metal band in the 1990s. That was brutal, but unrelated to the point. Aside from the iconography, which was intended as a sarcastic middle finger — a marketing ploy — metal is not so easily defined as some would think. Music is the universal language because it speaks to the spirit of man, not just to the mind...