What does Keats suggest about the song of the autumn season in "To Autumn"?

In the poem "To Autumn," Keats suggests that the song of the autumn season is solemn and somber.

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In the final stanza of the poem, the speaker describes the song or "music" of autumn. He describes this music as comprising the "wailful choir" of "small gnats mourn[ing]," the bleating of "full-grown lambs," the "treble soft" song of "hedge-crickets," the "whistles" of "red-breast" robins, and the "twitter[ing] of "gathering swallows."

The gnats produce a "wailful choir" to "mourn" for the loss of the summer. Their song is like a funeral song. The implication is thus that their song, and thus the song of autumn, is slow and sad. Added to this, the "bleat[ing]" of the "full-grown lambs" implies a fearful sound, as if the lambs (or sheep as they would be fully grown) are crying out for help. Perhaps they fear the coming winter.

The next addition to the music of autumn is the "treble soft" song of the "hedge-crickets." The fact that the song is "treble soft" ostensibly suggests a more positive, lighter aspect to the music, as the word "treble" indicates the higher range of musical notes. This impression, however, is undercut when we consider that robins typically sing at sunset, as the day is turning into night. The suggestion here is thus the suggestion of an impending darkness, compounding the impression of a music which is mournful and solemn.

The final sound to contribute to the music of autumn is the sound of the "gathering swallows" twittering. This twittering signals a farewell, as the swallows are likely gathering in order to migrate south to escape the winter months. The twittering thus suggests the onset of these winter months and so adds to the somber, solemn tone of the autumnal music.

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