PC Music held its Pop City Party in L.A. on Wednesday night, where A.G. Cook, Danny L. Harle, QT, Hannah Diamond, and more were all scheduled to perform. Carly Rae Jespen and Charli XCX both made appearances to deliver new music. Charli and Cook debuted a new song, (apparently called 'Bounce') and Jepsen sang her previously heard but yet still unreleased 'Supernatural' single with Harle. Watch below.