"The Wheels on the Bus" is a classic nursery rhyme and children's song that is popular with young kids. The song describes various parts of a bus and the actions they perform, such as the wheels going round and round and the wipers going swish, swish, swish. "I Spy" game to the song involves encouraging children to look for specific objects or actions mentioned in the lyrics, such as spotting the wheels, wipers, or other parts of the bus as they sing along.