Gee, Sandburg's American Songbag doesn't have a very long version. Here it is:

WAILLIE, WAILLIE!

When cockle shells turn silver bells,
Then will my love return to me.
When roses blow, in wintry snow,
Then will my love return to me.
Oh, waillie! waillie!
But love is bonnie
A little while when it is new!
But it grows old and waxeth cold,
And fades away live evening dew.

Sandburg's notes: An arrangement of an old-time British piece as made known by Daniel Read and Isadora Bennett Read of Chicago, Illinois, and Columbia, South Carolina. Its stately diction might be compared to certain laced ladies and ruffled gentlemen imprisoned in fine porcelain works of England a century or two ago. It is a deep heart cry, too profound and prolonged to be called poignant, yet shaken with memory of passion.