But the real reason "What Do You Mean?" entered the world as a success is that people wanted more Bieber after "Where Are U Now." Unlike so many pop stars' efforts to grow up in the studio, Bieber actually charted new territory (at least within the realm of top 40 sounds) with his Diplo/Skrillex collabo. While One Direction nabbed a successful big boy hit with "Story of My Life," it was unmistakably Mumford & Sons -- and clearly, playing authentic folk-rock is not 1D's future. The adult contemporary tone they adopted on "Drag Me Down" is a more likely direction for their future (together or separately), but again, there's no denying it sounds like something we've heard before -- in this case, Maroon 5.