From the depths of the popstar doldrums, Justin Bieber has risen again. After four years of controversy, a heated financial dispute with his longtime manager, numerous reports of him “ crashing out ,” and very little new music to distract us from this, Bieber finally silenced critics in July with his blissed-out comeback record SWAG . It’s his best work in a decade, a collection of soulful ballads and rap linkups that has the authentic, homespun charm of a mixtape. Improbably, with less than 24