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Others headbang behind black-and-white face paint, mirroring their idol.

"Metal fans like to headbang a lot, so they're not necessarily bouncing," Tepp added.

The six-piece switch from delicate beauty to righteous fury at the flip of a switch, and Morris is an eminently watchable front woman, punctuating every beat with a balletic swirl or a hair-flailing headbang.

In order to penetrate to the same depth with shock absorption, the birds would have to headbang harder, counteracting any built-in protection.

These are kids who lag in gym class and get shoved into lockers, but in the privacy of their makeshift practice space, they sure know how to solo, riff and headbang.