The song "Imagine" by John Lennon is about a change in the belief system and value system of a people. This would seem to relate to Orwell's book. 

Also, you might look at the Beatles song, "Carry That Weight", a song about how one person carries the burden of an ideal within the context of a relationship. In Animal Farmthis burden is given to Snowball as well as the rest of the animals that are oppressed by Napoleon's regime. 

I am not sure what you are asking about Animal Farm, however, there is one song in the book that is significant and that is "Beasts of England," which the animals sings as a song of revolution.

They also sing this song in triumph after they successfully defend the farm against the humans and when they bury their executed comrades after Napoleon starts killing animals.

The song is eventually banned by Napoleon, who wants to strip away the unifying quality that the song offers the animals in order to keep them isolated and in fear. 

You can find the words to the song, "Beasts of England" in the book itself.

"Old Major’s dream is of a world without man. He teaches them the revolutionary song Beasts of England.'