Question about a track in the film Deliverance

Idk where else to post this. In the movie Deliverance, when the guys have just started out the canoe trip there are a few scenes of them peacefully starting to paddle down river. In one of these scenes they pass by the banjo kid who is sitting on a bridge that goes across the river. I have tried for ages to find the name of the song playing during these scenes. The soundtrack does not have the song as far as I can tell. If anyone knows where I should post this please let me know, it's driving me nuts. via /r/movies http://ift.tt/2tNneQb