Where did you get the information that it's derived from a folk tune, Dick? I can't find that anywhere. What I do know is that it's one of the most beautiful and accomplished pieces of orchestral writing that I know. There are several strands in the second subject group (which is why I call it a group), the Caddick song tune being closely derived, I'd say, mostly from the first strand in which the tune is played fairly simply but with amazing ebb and flow. There's another quicker theme, then the "song tune" comes back with a different accompaniment in 12/8, and then a final strand, just before Tchaikovsky's Big Bang, in which the tune is reprised finally and poignantly on the clarinet along with "a dying fall." I've loved this movement for over forty years. My most treasured recording of it is Mravinsky conducting the Leningrad Phil in the 1957 mono version. Sorry for the gushing digression!