"London Bridge Is Falling Down" is a traditional nursery rhyme and singing game that dates back to the 17th century. The song describes the deterioration of London Bridge and the efforts to repair it. Children often sing the rhyme while playing a game that involves forming an arch with their arms, allowing others to pass underneath. The rhyme has various versions and has been popularized in many cultures. It reflects themes of construction and decay, and it has been used in educational settings to teach rhythm and coordination. The song remains a staple in children's music and games around the world.