discipline, dignified and determined protest and demand for freedom now. >> reporter: but at first when king walked to the podium he seemed restrained and read from a prepared speech. suddenly, singer mahalia jackson burst forth. >> i see her -- i see her, when her voice comes, i say, tell them about the dream, martin. tell them about the dream. >> reporter: the dream, his dream. a refrain he had been using in speeches on the road. but it was not part uh the speech he prepared for that day. his advisers told him he needed something new. but suddenly -- >> i still have a dream. >> yes! >> -- it is a dream deeply rooted in the american dream. >> when i heard him say "i have a dream," i said, oh, expletive, because we had been up and down the steps all night working on this alternate ending climax.