The suggestion that would best enhance a reader's understanding of the poem is to Read a variety of sources about the style and instruments used by jazz musicians.
This refers to the use of words that are separated by stanzas to convey the thoughts and feelings of the poet.
Hence, we can see that from the complete text, the author talks about the use of jazz music, and to better understand the theme of the poem, one would have to read a variety of sources about jazz musicians.
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