As a side note it is owned by Folkways Music Publishers Inc. which point even pointier to it being an anon song as that's what they published in large part.. ...

and from a youtube

This song (chorus only) was in Carl Sandburg's book "American Songbag" (1927)
Lee Hays (of the Weavers) wrote the verses.

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again