For those that are interested in the ambient sounds that are "Eerie Exchange Prairie Park", it is available online (free) at Absurd Music.
Michael and Matthew have enjoyed it about as much as I have. They listen to the sounds and talk about what it makes them think of, even making stories about what they are hearing. I'm even considering playing it as background music on Halloween. Not to say it's 'scary' music, just sets a certain mood.