One Direction

The boys in One Direction might have started out as a Simon Cowell–groomed pop product, but in the years since their 2010 X Factor debut they've more than proved their worth as one of the world's biggest acts. Their latest LP, Four, is a bona fide smash full of stadium-rock swells and huge sing-along hooks that have more in common with the Who or Fleetwood Mac than NKOTB. Sure, there will be bus loads of screaming tweens angling for a selfie with Harry or Zayn (sorry, Louis). There'll also be plenty of grown-ass adults lured by the group's unaffected, unpretentious pop-rock, unashamedly belting out megahits like "What Makes You Beautiful."