The bombing became a powerful symbol of the depth of racial hatred in the South and helped build momentum for later laws, including the 1964 Civil Rights Act and the Voting Rights Act of 1965.
The Rev Arthur Price taught the same Sunday school lesson that members of the 16th Street Baptist Church heard the morning of the bombing "A Love That Forgives." Then, the rusty old church bell was tolled four times as the girls' names were read.
Rudolph was 12 at the time, and her family left the church after the bombing. She said it was important to return in memory of her sister, who was 14, and the three other girls who died: Carole Robertson and Cynthia Wesley Morris, both 14, and Denise McNair, 11.
"God spared me to live and tell just what happened on that day," said Rudolph, who testified against the Klansmen convicted years later in the bombing.
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During the sermon, the Rev Julius Scruggs of Huntsville, president of the National Baptist Convention USA, said, "God said you may murder four little girls, but you won't murder the dream of justice and liberty for all."
Later yesterday, US Attorney General Eric Holder and others were set to attend a commemoration. Former Secretary of State Condoleezza Rice, a Birmingham native who went to school with McNair, was among the scheduled speakers.
Two young men, both black, were shot to death in Birmingham in the chaos that followed the bombing.
Birmingham was strictly segregated at the time of the bombing, which occurred as city schools were being racially integrated for the first time. The all-black 16th Street Baptist Church was a gathering spot for civil rights demonstrations for months before the blast.