I will say that I thought that in last year's Thomas performance (the full-length, two 40- minute set one, which I don't get to do that often), the second half was so much stronger than the first that I'm trying some new material to pep up Part One a little.
This is one of the songs I'm putting in - I learned it years ago off my Ewan MacColl album. It doesn't refer to any specific event in the book, but it certainly establishes the landscape!