cumulative song, a series of twelve verses.
According to The Oxford Dictionary of Nursery Rhymes, "Suggestions have been made that the gifts have significance, as representing the food or sport for each month of the year. Importance [certainly has] long been attached to the Twelve Days, when, for instance, the weather on each day was carefully observed to see what it would be in the corresponding month of the coming year. Nevertheless, whatever the ultimate origin of the chant, it seems probable [that] the lines that survive today both in England and France are merely an irreligious travesty."[1]