Dr. Dre & Co. took the weight of the hip-hop culture on the Super Bowl stage, shouldered the pressure from skeptics and delivered a strong halftime show to prove that edgy rap can work at the world’s biggest sporting events. All it took was hip-hop’s most controversial figures — and one knee taken by music’s most prominent white rapper. Dre, Snoop Dogg, Mary J. Blige, Eminem and Kendrick Lamar were headliners along with 50 Cent as a special guest at the Super Bowl halftime show on Sunday. Their collective performance is one of the best since Beyoncé and Bruno Mars’...