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Melissa Etheridge says she has enjoyed getting in touch with her punk side as she prepares to temporarily replace Green Day’s Billie Joe Armstrong in the American Idiot

Broadway musical.

It’s been crazy. Oh my God, it’s so fun, though,” the folk rocker says. “I’m having a blast. I’m so outside of my comfort zone and I’m like living out high school fantasies.”

Etheridge, 49, takes over the part from Green Day’s lead singer Billie Joe Armstrong for eight shows, from Tuesday to Sunday. Armstrong, the composer and co-author of the musical, returns Feb. 10 as part of a 50-show stand.

The high-octane show follows three working-class characters as they wrestle with finding meaning in their lives. One joins the Army and is deployed to the Middle East, one becomes a father and struggles with domestic life, and one descends into a drug-fueled life in the city – thanks to St. Jimmy, a sort of charismatic dark angel originally written for a man.