Jay-Z Signs The Roots to Def Jam This is long overdue, The Roots, who've played backed Jay-Z in numerous acoustic sessions , are Def Jam's newest group. Last week we hinted that Jay-Z was looking to sign The Roots, now the deal is official. The Roots are currently putting the finishing touches on their album, 'Game Theory' to be released early next year. Some of the guests include Black Star and Saigon. saxat från hiphopgame.com