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Rihanna, Selena Gomez, Metallica top Global Citizen lineup

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The Global Citizen Festival is a free concert put on in Central Park to bring awareness to major issues. Global Citizen CEO Hugh Evans, music star Usher and actress Priyanka Chopra join TODAY to announce the lineup for the Sept. 24 event, which includes Rihanna, Kendrick Lamar, Selena Gomez and Metallica.