Precocious pianists and angelic-naughty prepubescent crooners dominate the underage entertainment ranks, but kids seldom dive into the unforgiving world of malevolent metalcore. Before he was old enough to drive, now-16-year-old guitarist Austin Turney started shredding in a group called Worth Dying For. It turned out that name was spoken for, but rather than insisting on a duel to the worthwhile death, Turney's act became Arms of Agony. He proved his impressive range in the anatomical-anguish field when he filled in on guitar for Eyes of the Betrayer, replacing an injured member. The sheer heaviness of his riffs (the breakdowns land like bowling balls dropped from an overpass) seems incongruous with his boyish build (waitresses probably still hand him the kid's menu). Austin deserves the title Kid Rock, but that, too, is taken.