Questlove couldn’t believe his eyes. Two years into The Roots’ run as house band on Late Night With Jimmy Fallon, the legendary drummer stared at a calendar of the show’s upcoming musical guests. One name in particular jumped out at him, and he kept re-reading it over and over. “Odd Future.” That couldn’t be right, he thought. For months, the rap collective had been buzzing on blogs and internet message boards, attracting a cult following thanks to the wild charisma of ringleader Tyler, the Creator. But a performance slot on an NBC show? At this early stage in their career? No w...