Answer and Explanation:
"Animal Farm" is an allegorical novella by George Orwell which criticizes the Soviet regime in Russia. The animals in general represent the Russian people, while the pigs, specifically, represent the Soviet leaders.
Why do the animals cease to sing "Beasts of England"?
"Beasts of England" was a song taught to the animals by Old Major, a boar who inspired them to begin their revolution. The song became a type of anthem, motivating animals to rebel against humans, and keeping them motivated to work toward achieving an equal society. The animals have to stop singing it, however, because Napoleon, their leader, demands them to. The excuse given to the animals is that the song is no longer necessary because the revolution has already taken place. However, this is just another way Napoleon has found to keep the animals under his dominance.
What is the song that replaces it, and how is it different from its predecessor?
The song that replaces "Beasts of England" is the following:
"Animal Farm, Animal Farm,
Never through me shalt thou come to harm!"
The song is simple but uninspiring. It sounds as if it is an attempt to brainwash the animals, as if by repeating it they will convince themselves to behave well, to not question, argue, or fight. Again, this is simply a way Napoleon is using to reinforce his own authority, just like dictators in real life often have people sing songs about them and the well-being of the nation.