Frogman, if you look in the dictionary, you will see the definition of different words; they are meant for everyone. The definition of the words I use are for "specific" aficionados. They will know what I'm referring to because it's meant for their eyes only.
If we had a broad "universal" type audience that would include at least 50 members, then I would use "universal" definitions.
While there may not be any such thing as "soul jazz", there is according to Alex; consequently that has meaning, and that post was meant for him, although we all enjoyed the music.
If I was well enough, I would have written a post for Dave, because I know exactly what he meant, and in my lifetime of listening to "blues" and jazz; they can be most ambiguous when used as reference to one specific tune.
The bottom line in communicating with such a small number of people; I am communicating with "persons"; consequently, as long as that individual know what I mean, "all is well".