Way Down South in Dixie
(Break the heart of me)
They hung my black young lover
To a cross roads tree.
Way Down South in Dixie
A phrase of exasperation, much like: “Lord, have mercy…” 
 Hughes makes similar use of parentheses in  Let America Be America Again  to capture the relative voiceless of African Americans in comparison with the privileged voices of, in this case, popular Dixie music and ideology.
Song for a Dark Girl