Certain styles of music seem incompatible with long careers. Death metal is high on that list, with the focus on brutality and shredded vocal chords standing at odds with the rigors of aging. If it's true that people tend to mellow with age, it would stand to reason that death metal would not be populated by elder statesmen. Yet it seems to be that conventional wisdom, once again, is wrong. Death metal finds itself seeped in figures from the early days still cranking out new music.