On Feb. 19, Kendrick Lamar delivered one of the best Superbowl halftime show performances in recent memory. During the performance of the final song, “tv off,” Lamar brought out Dr Mustard, the song’s...

Few artists could release a collection of unmastered demo songs and have it become the top-selling album in the nation. Even fewer rappers could in an era where record sales are becoming less and less...