Old MacDonald Had a Farm is a children's song and nursery rhyme about a farmer named MacDonald (sometimes known as "McDonald" or "Macdonald") and the various animals he keeps on his farm. Each verse of the song changes the name of the animal and its respective noise. In many versions, the song is cumulative, with the animal sounds from all the earlier verses added to each subsequent verse. For example, the verse uses a cow as an animal and "moo" as the animal's sound. It has a Roud Folk Song Index number of 745