Answer:
The woman who performed an open-air concert in front of the Lincoln Memorial in the spring of 1939 after the Daughters of the American Revolution barred her from singing in their Constitution Hall was Marian Anderson.
Step-by-step explanation:
Marian Anderson was an American contralto who became the first American opera star and established herself as one of the greatest concert performers of the twentieth century, excelling in a varied repertoire ranging from lied to American gospel. The best-known event in the singer's long career was her historic recital at the foot of the Lincoln Memorial in Washington in 1939, where she drew a crowd of 75,000 in a musical protest against racist attitudes suffered by the artist.