Read the excerpt from "The Weary Blues." He made that poor piano moan with melody. O Blues! Swaying to and fro on his rickety stool He played that sad raggy tune like a musical fool. Sweet Blues! Coming from a black man's soul. O Blues! The phrases "O Blues!" and "Sweet Blues!" are examples of.

It could be repetition.

Explanation:

It repeats the word O Blues!

That is my best guess

"the tune the he might never know again." this part build anticipation. dexter got extremely happy by the piano tune. he could see what he was living at that moment in his life throught this feeling. the reader might want to learn more about his happy life. in fact, he called it a state of   'ecstasy'. the fact that he had got in a mood of intense appreciation and that everything about him was extremely bright and glamorous might lead the reader to feel that this state of happiness may not last long. the two parts from the excerpt that exemplify the anticipation are: " the sound of the "; " it was a know again."