5. What message about challenges does the author express

through "Sweet, Difficult Sounds"?

The phrase in the work simply refers to the difficulty of language to express.

Explanation:

The "Sweet, Difficult Sounds" are often the elementally deceptive words that are so often sued their effect has been blunted to the listener and thus the poet searches for newer words to express that idea with more fruit.

This is an issue with expression that is shown by the phrase.

This is so that there are words that seem sweet but are not entirely showing what needs to be shown or the people are not able to understand what is being illustrated there.