In 2010, an unknown BRIT School graduate singing over dizzying bass drops took the U.K. singles chart by storm with the song "Katy on a Mission," a boastful dubstep heater featuring the lyrics, "When we erupt in to the room, and hear the sub go boom."

"I would have been a rapper if I wasn't born a ginger girl," Katy says with a laugh, calling in from London.

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