Thanks for your response. I had seen (too late to go) a notice of Dan's film being shown in a library a couple of years ago, and I called Dan. From my discussion with him, it seemed that his show may not be the same one I saw back in 1973, although it may derive materials from it. At any rate, he was not able to offer any help in tracking down the song writer(s) at the time. In case there might have been something I missed, or misinterpreted, back then, I called him again (no one home/left a voice message), and will try to find a way to see his film at it's next screening if at all possible. There was a short comment on his film in last Wednesday's Gloucester Times, so it may be running again soon.