While the elastic earworm “Can’t Get You Out of My Head” remains a master class in diva-level confidence, Fever is a filler-free arsenal of percolating disco and dance pop. Driven by lean, pulsing production and the Australian actress/singer’s breathy vulnerability, songs like “In Your Eyes” are bubblegum gems of both the romantic and aerobic variety. Meanwhile, “Love at First Sight” and “Dancefloor” double as ticklish devotionals to music itself. Every track is a heat-seeking summons to the club, the bedroom, or both.