The answer is:
"Long after it was heard no more"
This line refers to the fact that he cherish the memory of that song, and how it sounded in his heart, even years after she ceased to sing it, he still listened and cherished it in his heart.
Answer:
The line from "Solitary Reaper" is most thematically similar to the theme of eternal art in "Ode on a Grecian Urn" is "Long after it was heard no more"
Explanation:
This line talks about how moved was he within himself when he listened to the maiden singing that song that even after years and distance he kept on listening to it because it was deeply touching, which is the concept of art in "Ode on a Grecian Urn".
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