While Ellie Goulding, Gwen Stefani, and John Newman enliven their respective Vegas club staples, and "Summer" contains one of the year's most grandiose synth crescendos, it's the curveballs that steal the show here. The opalescent "Pray to God" sounds more like a Haim song spiced up by Calvin Harris than vice versa, and "Dollar Signs," featuring vocals by R&B young turk Tinashé, is a clever funk-EDM hybrid.