It resembles old horror film soundtrack music played on calliope or pipe organ. It is a modern synthesizer rendition though. I'm thinking it closely resembles "Carnival Of Souls" but I'm not sure if it's the same piece or not.

http://www.youtube.com/watch?v=yMtM41M5uNs
http://www.amazon.com/Verne-Langdon-Carnival-Souls-Collection/dp/B000K2UW42