Repetition is a rhetorical device that repeats a group of words, phrases, or sounds a couple of times in order to remark the importance of an idea or to make it more memorable. There are many types of repetitions, such as anaphora (repetition of words at the beginning of verses/clauses,) antistasis (repetition or words or phrases in a different way,) and diacope (repetition of words broken by some other words.) In this case, the repetition is built around the word blues.
