““1963 March on Washington. Mahalia Jackson sang a triumphant “How I Got Over,” recalling the storefront singer of her youth and not the officious matriarch of national television. But she did more than set the crowd up for Dr. Martin Luther King’s speech. When Dr. King’s first paragraphs didn’t excite, the showman in Mahalia instructed her to go with the hits. “Martin, tell them about the dream,” she kept repeating until he got the message. Without her insistence, America would not have heard his most famous words.””