Final answer:
Napoleon bans the singing of 'Beasts of England' in 'Animal Farm' to eliminate revolutionary spirit and reminders of unfulfilled promises, consolidating his power and control over the animals.
Step-by-step explanation:
In the book 'Animal Farm' by George Orwell, Napoleon bans the singing of 'Beasts of England' because the song represents the revolutionary spirit and hopes for a better future that led to the rebellion against the human farmer Mr. Jones. As Napoleon consolidates his power and the society on the farm starts to mirror the oppression of the past, the song becomes a symbol of unfulfilled promises and a reminder of the initial ideals that are no longer being pursued. To maintain his authority and discourage dissent, Napoleon eliminates the song to supplant the ideals it represents with his own doctrine, thereby ensuring that the animals remain under his control without the hope of rebellion that the song incites.