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
alliteration
repetition
hyperbole
simile