The idea that someone with no visible research into a subject can attack the works of those who have spent a lifetime studying an enormous amount of material and has the research there to prove it, is frankly laughable. Nick/Bob, you are trying to convince a block of wood.

The only thing I can add to Bob's excellent summary is something I have posted frequently on Facebook. Any musical genre (in fact most genres) are not finite. As you demonstrate, there are variable factors involved and the relationships between any genres can best be demonstrated by Venn diagrams.

The 1954 whatever it is, is not a definition, it is a list of descriptors, and any particular song being studied might only demonstrate a number of those descriptors. The many people from many countries who discussed those descriptors in 1954 were not all convinced of its usefulness. Maud was the instigator and the one who drew up the list. She initially had in there the 'anonymity clause' which was quite rightly thrown out in the following year.