A zipper song is one in which the basic format of the song stays the same – same melody, same verses, same chorus. The only thing that changes is one small element. For example, Old MacDonald is a zipper song – you only change the animal and the animal sound each time you sing the song. God Is In is also a zipper song. The lyrics and melody and format are the same each time. The only thing that changes is “where” God can be found – that gets “zipped” into the song. It’s a wonderful tool for teaching songs to children because of the repetition.