Jack Fell Down and Broke His Crown

Why is it that so many of our "nursery rhymes" share a melancholy theme? Chicken Little and the falling sky, the Three Little Pigs, and Rock-a-bye Baby hint at some tradgedy. For a falling sky, or a falling crib with child, or kin eaten by a wolf, all speak of some tale that that hints perhaps at a larger tradgedy. Yet none tells of a tale more real and tragic than that of Jack and