After holding top posts at Def Jam and Warner Music and managing Mariah Carey and D'Angelo, Kevin Liles went back into the label world a decade ago as co-founder of 300 Entertainment — which was sold to Warner for a reported $400 million in December, after scoring big hits with Megan Thee Stallion, Young Thug and Gunna. He talks about his career, what's next for him and 300, and Mary J. Blige's new album and Super Bowl Halftime appearance.