The theme of the Hognaughts, a group of pigs that walked upright, worshipped Pig-Brain, and spoke in "Pig Latin Squared", which applied the rules of Pig Latin to the actual language Latin.
The Hognaughts would have been encountered several times and were the most intelligent mutants the player would encounter, capable of building bases with bathrooms and kitchens. They may have even captured the player as a sacrifice to Pig-Brain, and at one point a sequence was planned in which the player would infiltrate a Hognaught dwelling disguised with a Hognaught mask.
This track is my favorite. It's more of an individual piece of music than a looping soundtrack. The theme from "The Seeker + Pig-Brain" is used again, and a new melody is introduced over a waltz that later in the track becomes distorted and confusing. A slower section and a fast dance round off a representation of the emotions and high culture of Hognaught life. The artwork also works especially well with this one.