When the animals start to sing "Beasts of England" after the"purges" of the animals who were allegedly allied with Snowball, Squealer stops them, saying:
It's no longer needed...Beasts of England was the song of the Rebellion. But the Rebellion is now completed. The execution of the traitors this afternoon was the final act. The enemy both external and internal has been defeated. In Beasts of England we expressed our longing for a better society in days to come. But that society has now been established. Clearly this song has no longer any purpose.
The pigs are now more interested in enforcing obedience to Animal Farm than in proclaiming the rights of animals. Hence Minimus's song glorifies the achievements of the farm and causes the animals to pledge their obedience to it.
Animal Farm, Animal Farm, Never through me shalt thou come to harm!
In Chapter VIII we learn of a poem written by Minimus that celebrates Napoleon alone in obsequious terms, celebrating him as the "fountain of happiness" and "giver of all that thy creatures love." It is placed alongside a portrait of Napoleon on the barn wall opposite the Seven Commandments. This makes it clear that, as the first response says, obedience to the farm is obedience to Napoleon.