Metal has a lot of subgenres, some of which really are just noise, and labeled as noise metal.
But the vast majority of metal is closer to classical music than any other modern music, including jazz.
If you enjoy Bach, Beethoven, Vivaldi, Mozart, etc, the closest modern composers to them are all in metal bands. That is a Berkley fact.
Music concept aside, my point is about lyrics being the most important part of a song, not the musician or the style.
Jason's point about "Christian" bands is not really on target, because all of us who listened to the lyrics of As I Lay Dying knew that they were not Christians, and were not talking about anything that had productive spiritual value, but only hopelessness.
This is where discernment comes in.
Where that band was a wolf in sheep's clothing, not all are. Don't be a fool and throw out everything due to one example.