Mary J Blige Signs to 300 Entertainment Mary J. Blige has a new home for her music. She is signed to 300 Entertainment. 300 Ent is home to Young Thug, Migos and Megan Thee Stallion and more. While 300 is mostly a hip hop label, they don’t call Mary J. Blige the Queen of Hip Hop Soul for nothing! 300 Entertainment is run by industry legend Kevin Liles.