Long+live+Animal+Farm!+and+after+the+singing+of+'Beasts+of+England'+the+animals+were+dismissed.

propaganda:

This quote is some sort of a propaganda because Napoleon is forcing the animal to remember that he is superior and the society is a harmonious place. He sings the Beast of England. This brainwashes the animals by making them have feeling of patriotism and is reminding them to work harder.