Is anyone in music having more fun right now than 2 Chainz? The Atlanta MC has become hip-hop's most irrepressibly entertaining star, and his second LP further displays his knack for playfully hollering about money like he's the first guy who ever had so much paper he couldn't fold it. "Crib so big a dinosaur could run through that shit/I'm a shark and you're a tuna fish," he raps on "Mainstream Ratchet." He tries on some new looks here – the Pharrell-produced, Caribbean-tinged "Feds Watching," the Fergie duet "Netflix," the somber dead-homeys elegy "Live and Learn." But nothing slows down the self-described Black Unicorn's scene-chewing charisma.