Also.....just sayin'.... I found 21 different singers of TLTOMM on Youtube - not all folk singers by a long chalk, nor all back in the 1960s, and I know of others who have covered it. Several versions of Tom himself singing it, and even a reggae version. 3 other songs by the same title, but obviously not the same song.
We have a gig on Mon 2nd Oct, at which we shall sing TLTOMM to a very mixed, non-folkie audience. Might also throw in the Zoo song to see which of the 2 gets the most joining in. So watch this space!