Respuesta :
The phrases "O Blues!" and "Sweet Blues!" are examples of
- Repetition
What is Repetition?
This refers to the literary element which is used in the plot development as it is used to call attention to something in a text.
With this in mind, we can see that repetition was used in the phrases O Blues and Sweet Blues because it was meant to call attention to the melody of the poor piano man.
Read more about repetition here:
https://brainly.com/question/596301