In 1939 singer Marian Anderson was supposed to give a concert in Washington, D.C., at Constitution Hall.
But the group that owned the building, the Daughters of the American Revolution (DAR), refused to let her sing there because she was an African American.
First Lady Eleanor Roosevelt was outraged and helped arrange for a concert at the Lincoln Memorial.
There, on Easter Sunday, Anderson performed for 75,000 people, and many more listened on the radio. This event became a symbol for the civil rights struggle.
Later, in 1955, Anderson became the first African American to sing at the Metropolitan Opera.