“Michelle Obama – with Sasha, 8, and Malia, 11, and about a dozen other people in tow – took in the matinee performance of ‘Memphis’ Sunday. … The musical tells the story of a white DJ, Huey Calhoun, in 1950s segregated Tennesse; his love for a black singer, Felicia Powell, and the then underground sound that gave birth to rock and roll.”