The speaker uses voices as a metaphor in lines 2 and 32. For what abstract idea are voices a metaphor? What is the significance of the voices being “remnants” and “buried in the Mississippi mud”?
Metaphor is the use of words to directly compare to dissimilar things, qualities or persons. For example, "John is a lion" compares John directly to a lion.
Please note that your answer is incomplete, so I am giving you a general overview which should enable you get the correct answer.
Metaphor should not be confused for Simile, because even though they both make comparisons, simile uses "like" or "as" to convey the comparison, metaphor compares directly.
There are four types of metaphor which are: Standard, Implied, Visual and Extended Metaphor.