Now that they’re backed by Def Jam prez Jay-Z, the Roots should be feeling better than gettin’ head on a Sunday afternoon. With the major marketing dollars afforded by rap’s most respected record company at their disposal, the Philadelphia outfit is finally free to drop ambitious, thinking man’s hip-hop with no qualms. But judging from the glum Game Theory, the group’s seventh studio album, ?uestlove and crew are not exactly in a celebratory mood these days. From poet Wadud Ahmad’s foreboding spoken-word chorus on “False Media” to the touching J Dilla memorial “Can’t Stop This,” this latest offering from the Roots ...