KID ROCK Rebel Soul [Atlantic] On his ninth studio album, Kid Rock lightens up. He’s never exactly been a brooding singer-songwriter, but after stepping up his game with 2010’s Rick Rubin-produced Born Free and dabbling in politics during last year’s Mitt Romney campaign, he seems ready to fling off the fedora and let his hair down. He leads listeners right into the party with “Chickens in the Pen,” a solid Southern rock foot-stomper. He’s...