Music is “one of the most powerful forces in the whole world,” says John Cooper, founder and frontman of rock group Skillet. “All the eras of our lives you can probably remember the music you were listening to and it defines you… Music changes our mind about things.” Unusually, the band splits its time between Christian and secular appearances. “I just didn’t want to sing to Christian people,” Cooper says. “Not all our songs are religious.”

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