Compared to rock years, dog years seem mercifully short. In music, time is generally unkind and immortals reliably turn into sad cartoons: Did anybody but the most desperate sycophants actually flip for Black Sabbath circa TYR, slobber over Recycler-era ZZ Top, or worship Metallica's St. Anger? (If you answered "yes," please vacate your parents' basement within 24 hours.) After a few decades in the trenches, can a loud, prolific band realistically expect to keep blowing its audience's mind?