Although the wording in your question is a little bit confusing, I believe it is asking you to analyze the use of repetition in those two poems by the American poet Langston Hughes (1902-1967). Repetition is the use of the same words, phrases, or even sentences in a text in order to emphasize them and make them easier to remember, as well as to create an artistic effect and provide rhythm. In the short poem "Harlem," Hughes repeats the phrase "Does it...?" three times. Since this phrase is located at the beginning of the sentence, the repetition is called "anaphora." It provides rhythm and fluency to the poem, and it stresses its interrogative nature. In "The Weary Blues" the repetition is interspersed throughout the poem. "He did a lazy sway" and "O Blues!" are repeated on several occasions, as well as the lyrics that the character, a musician, was singing "down on Lenox Avenue the other night." In this case, the repetition of those specific words and phrases contributes to emphasize the melancholic, or blue, mood of the poem, and also its musicality - half of the poem is, in fact, a song.