Which of the following works is NOT considered an example of John Keats' poetry?

The work "To His Coy Mistress" is not considered an example of John Keats' poetry because it was actually written by Andrew Marvell, a poet from an earlier period known for his metaphysical style. John Keats, a prominent figure in the Romantic movement, is celebrated for his own body of work that includes the other titles listed, such as "Ode on a Grecian Urn," "Ode on Indolence," and "Ode on Melancholy." Each of these odic poems encapsulates themes common in Keats' writing, such as beauty, transience, and the nature of art. Consequently, the correct identification of Marvell as the author of "To His Coy Mistress" allows us to differentiate it from the authentic works of Keats.