When did hip-hop become such serious business? Rappers nowadays—moonlighting as moguls or bickering over who's the "realest"—can't seem to lighten up. But last year, Jamaica sent aid. Dancehall reggae's raw energy roused flexing and flossing hip-hoppers and made them dance again. Poster child Sean Paul took the undiluted genre platinum, tutored 50 Cent and Beyoncé in Jamaican patois, and triggered reggae's joyride on the pop charts. Why not hold Paul responsible, too, for the sudden trendiness of red, gold, and green Rastafarian armbands? (Yup, that's one on Beyoncé in her "Crazy... More >>>