It's it though? I love the imagery, like "swallows circling with their shimmering sound," and other lines.

I discovered int in reading a short story by Ray Bradbury, of the same title. It's a heart-wrenching story, and he uses the poem in it beautifully. I was reading some of ther other poems because I liked this one, and I found one about love that I liked even more (if possible.) And it was also both lovely sad. I had to use it in a Spuffyfic-- you can read the poem here, at the very top of the story.