It's a Small World was written by brothers Robert and Richard Sherman for the 1964 New York World's Fair, where it accompanied a boat ride celebrating global unity and childhood. The attraction later moved to Disneyland, and the song became one of the most widely recognised tunes in the world, played continuously in the parks and covered in countless parodies and references. Its simple melody and optimistic message have kept it in use for decades, both as a sincere symbol of togetherness and as a playful shorthand for innocence in online videos.