"London Bridge is Falling Down" is a traditional nursery rhyme and singing game that dates back to the 17th century. The song describes the various attempts to repair London Bridge, which has been a significant structure in London for centuries. The rhyme reflects the historical challenges faced in maintaining the bridge. The song is often sung by children while playing a game where they form an arch with their arms. As the song progresses, players lower their arms to "catch" others, creating a fun and interactive experience. The rhyme has many variations and has been passed down through generations.