Tariq Trotter, best known in music as Black Thought, the emcee of the Roots, is regarded by many hip-hop fans as one of the best freestyle rappers ever. His work changed shape when the Roots became the house band for Jimmy Fallon’s late-night show, and again when he began performing standup comedy. “I’ve spent most of my career with my sunglasses and my hat pulled down low, very many layers of defense,” he tells Jelani Cobb. “You’re up there as a comedian, it’s just you and your ideas and a microphone, no light show, no band. . . . After having done this for over thirty years, what else can I do, how can I become a better storyteller?” Trotter’s latest endeavor has been writing the music and lyrics for “Black No More,” a musical-theatre production based on the eponymous novel, by George Schuyler;  the script is by John Ridley, with direction by Scott Elliott. Schuyler’s book is a dark satire, written during the Harlem Renaissance, that describes the development of a “cure” for Blackness; Trotter stars as Dr. Junius Crookman, who believes that this remedy will solve America’s problems with race. “My focus became almost rapping as little as possible” in the show, Trotter says; “I wanted this to be above and beyond folks’ expectations.”  “Black No More” is in previews at the Pershing Square Signature Center. It opens February 15th.