HARLOE is an upstart songwriter who can hang with music’s biggest names: she collaborated with soul-pop titan Kelly Clarkson on the hip-shaking “Heat” and the gospel-tinged “I Don’t Think About You”, and she helped craft choice cuts for Céline Dion and Britney Spears. But she can also push pop’s boundaries, as evidenced by her work on Charli XCX’s high-octane “Secret (Shh)” and ZAYN’s sun-bleached “Fresh Air”.