Not all music by Negroes is jungle beat. Negro spirituals, which W. E. B. Du Bois, in his book The Soul of Black Folk (Chicago; McClurg, 1903) called the only art form native to America, can be quite melodic. George Gershwin's work was heavily influenced by black American music.
No personal offense meant but I can't believe that a vile communist, W. E. B. Du Bois, is quoted here on Free Republic. He lived the remainder of his disgraceful life in Ghana.