"One for Sorrow" is a traditional children's nursery rhyme about magpies. According to an old superstition, the number of magpies seen tells if one will have bad or good luck.

A nursery rhyme is a traditional poem or song for children in Britain and many other countries, but usage of the term dates only from the late 18th/early 19th century. The term Mother Goose rhymes is interchangeable with nursery rhymes.