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If you're writing a poem, you are allowed to throw pretty much all the rules out the window. You can eschew just punctuation, just capitalization, both, split the difference per stanza or per line,...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/7331 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7331 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If you're writing a poem, you are allowed to throw pretty much all the rules out the window. You can eschew just punctuation, just capitalization, both, split the difference per stanza or per line, whatever works to convey your meaning. If it's significant to you as the poet that the city name should be capitalized, then capitalize it. If you've removed the capitals everywhere because it means something (the setting of the poem is supposed to be a monotone), and a capital letter signifies something else (a bright loud spark), then consider what capitalizing the city name will signify (this city is a bright loud spark!).