Has anyone had a better decade in Nashville than Brad Paisley? A string of superb albums has established Paisley as the city's most prolific, amiable and funny superstar. His new disc offers a typically appealing mix: prom ballads, gospel-tinged weepers, odes to fatherhood and plentiful yuks. But the heart of it is a double shot of widescreen optimism: the title track's party-hearty celebration of the melting pot, and the arena-rock-flavored "Welcome to the Future," which hails the technological revolution and (without naming him) Barack Obama — who may well be the only American on a bigger roll than Paisley.