I used to work at Halloween Haunt at Kings Island. In our section of the trail, they used to play a song/sound effects of a girl saying things like "the trees, they come alive!" and then a guy making sort of a moaning sound. you can hear parts of it in this video at about 6:05 on YouTube- Trail Of Terror Halloween Haunt Kings Island 2007

I would love to use it in my front yard, so if anybody can help me find it, it would be a great help!