Ain't no going back now," sings Iggy Azalea on the majestic opening track of The New Classic. It posits Azalea as pop-hop's latest superstar: a nimble, catty rapper who sounds perfectly at home amid a panoply of club-destined bangers. Helmed by a who's-who of in-demand producers (The Invisible Men, The Messengers, Stargate). Revved up and zooming like a Ferrari down Rodeo Drive.