March on Washington 50th Anniversary: About the March

From Credo Reference: "After nearly a minute-long ovation, with the television networks carrying him live, Dr. King delivered the final address of the afternoon. Until the peroration, King recited his text nearly verbatim, urging the black and white audience to keep fighting for justice in a land where all men were purportedly “created equal.”

But then, “with no alternative but to preach,” Dr. King suddenly departed from his text, from his “dream sequence” to the old Negro spiritual “free at last,” offering the most memorable lines of the day...."