Jason Mraz is a great big cheeseball who happens to be aging well. But he’s not Justin Timberlake, that onetime pop nerd turned smooth operator, either. On his new album, the little white guy still sounds giddy to be playing funk and soul, and the man-in-a-musical thing works better than ever: Silly lyrics and the occasional burst of scatting aside, these are irresistible songs, four-eyed soul to compete with the likes of Hall & Oates.