Not having looked in any detail myself, but your divisions/categories look fine from here.

>>>>>>Bronson has five music groups A-D with group B divided into six sub-groups.<<<<< should read 'A-E' presumably. It might be worth stating clearly the differences, if any, between your subgroups and Bronson's.


BTW the version I sing uses the tune and chorus of Bronson's 26 which comes from a few miles from where I live. AS for the text I make it up as I go along based on the many versions I've come across.