5 MLK speeches you should know. Spoiler: 'I Have a Dream' isn't on the list

The Rev. Ralph Abernathy (left) shakes hands with the Rev. Martin Luther King Jr. in Montgomery, Ala., on March 22, 1956, as a big crowd of supporters cheers for King, who had just been found guilty of leading the Montgomery bus boycott. (Gene Herrick/AP)

The Rev. Martin Luther King Jr.'s "I Have a Dream" speech, delivered on the steps of the Lincoln Memorial in 1963, is so famous that it often eclipses his other speeches.

King's greatest contribution to the Civil Rights Movement was his oratory, says Jason Miller, an English professor at North Carolina State University who has written extensively on King's speeches.