At the right moment the only thing I can say is that Frictional surely should use those already modern-classical music tracks by Nine Inch Nails "Piggy" and "March of the Pigs".
http://youtu.be/JfCvcFLdq4Y
http://www.youtube.com/watch?v=6mDQNRs5JCs
I seriously think the idea of the game itself came to them while they were listening to Nine Inch Nails. The whole 1994 Downward Spiral LP is about machines and piggies world. I hardly believe this is coincidental. I think this is a straight allusion.
Also there's a very little chance that the whole game is an allusion to the story of the Lord of the Flies character "Piggy". Quite a sad tragic and horrible story by the way. The book itself is somehow about the most horrible sides of human nature - and I think this might be one of the key themes of the game storyline. I don't think there's a straight connection between Lord of the Flies and Machine for Pigs. But... you know... hmm... our subconsciousness sometimes do such a strange things...