What is referred to by 'black blue baleen'?

Based on the clue 'black bart dropped his hanky while trying to rob o...', what is the answer? Based on the clue 'black beauty is a popular variety of this plant th...', what is the answer? What is referred to by 'black beauty'? What is referred to by 'black bering sargasso'? What is associated with: black boy is a 1945 autobiography by this native son author? What is referred to by 'black boy'? What is associated with: black brown and beige is a 1943 suite by this noble jazz bandleader? What is referred to by 'black brown spectacled'?