See previous threads for discussions on that topic; the song or tune has never been conclusively identified, so far as I know, and the debate continues. There are several candidates so far as I remember.

So far as the DT entry for Leon Rosselson's song is concerned, I think that the DT text was taken from Dick Gaughan's recording of the song, in which he changed some of Leon's words.

An internal link is made thus.

Type: <a href="/@displaysong.cfm?SongID=7972">WORLD TURNED UPSIDE DOWN (DIGGERS)</a>

When the message is submitted, this will produce:  WORLD TURNED UPSIDE DOWN
(DIGGERS)