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La Grange native Josie Dunne muscled her way onto the stages of local bars and venues at age 13. Four years later she signed a deal with Atlantic, and spent her final high school years traveling back and forth between suburban Chicago and Nashville while finessing her craft and writing for well-known musicians such as Kelly Clarkson (who passed on a song written by Dunne) and crossover social-media star Jacob Sartorius (who recorded “Chapstick,” cowritten by Dunne).…