The line from "Solitary Reaper" that aligns thematically with the eternal art in "Ode on a Grecian Urn" is "Long after it was heard no more."
The line from "Solitary Reaper" most thematically similar to the theme of eternal art in "Ode on a Grecian Urn" is:
"Long after it was heard no more."
In "Ode on a Grecian Urn," the concept of eternal art and beauty is conveyed through the idea of the urn being immortal and outlasting human existence. Similarly, in the line from "Solitary Reaper," the memory of the maiden's song lingers long after it has ceased, symbolizing a timeless and enduring quality.
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