It was on this day in 1972 that the "Queen of Gospel," Mahalia Jackson died. On today's "A Day in the Life," we explore the life and career of one of the world's most influential gospel singers and civil rights activists. Find out what Jackson said to Martin Luther King, Jr. during his famous "Dream" speech at the March on Washington that caused King to improvise a section of the speech and thus transforming it into the "Dream" speech.