I’m not sure what fits in this category.
There is flexibility but I was thinking of songs that have a poetic feeling to them. However, any song that you think is artistic is fine 
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Because Copland is one of my favorite composers, I have to offer up what is itself - Art. The is the most moving part of the piece.
John Prine’s first album from the early 70s was pretty much a collection of short story/poetic odes. Here’s one of the best from a really great treasure chest. Of course Bonnie R., can cover a great song better than most anyone else.