Martin, you are right, it isn't mentioned on his homepage. However, I have the LP "The Gospel According To Pete St. John" by Chisel, where each track is a Pete St. John song, and it is definitely on there, credited to Pete St. John. In fact it is track 1 on side 1. I don't know anything about the play you mention, but it might be interesting to know if there is a connection to the song.