Spore simulates the evolution of creatures from single-cell organisms through the space age, so the changes start at the very beginning: make your creature an aggressive carnivore, and the music will be noticeably different from that of a plant-eating species. The uses procedural music, meaning that the music a player hears will develop and mutate along with their style of play. Iconic producer Brian Eno was brought in to provide much of these tracks.
You know…before Spore, I’ve never heard of Brian Eno. Isn’t that a shocker? 😛