Paul McCartney, Jon Bon Jovi, Sheryl Crow, Fergie, Colbie Caillat, Natasha Bedingfield, Leona Lewis, Sean Paul, Johnny Rzeznik, Krewella, Angelique Kidjo (a UNICEF Goodwill Ambassador), Kelsea Ballerini, Nicole Scherzinger, Christina Grimmie, Victoria Justice and Q’Orianka Kilcher