Why do animals like the song "beasts of england" so much that they memorize it on the spot? to what emotions and needs does it appeal?

The animals liked the song "Beast of England" so much because it talks of the unity of the animals against the tyranny of the humans, and how they will be free of all forms of slavery and subordination.

It appeals to the animals' dreams of a free world where they will be their own masters, the need of hope away from any form of cruelty of their masters and even the availability of abundant food to last their lifetime, a world where they can enjoy and be safe.

Explanation:

George Orwell's science fictional novella "Animal Farm" is a story of the animals' trying to gain their independence and getting what they want, freedom from their human masters. But this did not turn up the way they wanted, for the very same power struggle that is thought to be the characteristic of humans also overtook them and eventually led to their downfall.

The song "Beasts of England" was first introduced by Old Major, a prominent and revered figure among the animals in Manor farm. He told them, about his dream, his vision of a free world for the animals and thus, this song further added to the animals' want for their own independent society. painting a vivid picture of when all animals will be masters of their own lives, the song struck a chord with all the animals.

It appeals to their need and want of the very world which the song paints, further instigating them to make it a reality. The song states "Soon or late the day is coming,  Tyrant Man shall be o'erthrown". Their dreams of being free of the humans, their want of abundant food to last forever, the want to have their own society, their own means of authority and their want to be free of any form of labor or slavery, all comes alive in the song.