How does the description of the Easter Sunday event in "Marian Anderson Sings" differ from the description of the same event in the biography of Marion Anderson? "Marian Anderson Sings" lists the songs that Marian Anderson performed, but the biography does not include this information.

"Marian Anderson Sings" includes dialogue while the biography only includes description.

"Marian Anderson Sings" describes Mrs. Roosevelt's major role in arranging the event, and the biography states that Mrs. Roosevelt was not very involved.

"Marian Anderson Sings" includes the number of attendees while the biography does not address this detail.