Is this geared to work with Classical music and the Classical Extras plugin with Picard.Short answer: no
Well, the answer is 'yes' actually.
The reason I answered 'no' so quick, is because for my classical, and non-classical music I have dedicated and separate portable installs for both MusicBee and Picard.
So for me 'the two shall never meet'.
And for my classical Picard I am using dedicated scripts, and I haven't been testing this specific Enhanced Genre list on it for a while.
So that's why I said 'no' without thinking it through.
But it should work fine, because the list contains all genres from MusicBrainz, and that is where Classical Extras also retrieves them.
The only exception (I know of) is that CE sometimes also retrieves 'work type' genres. And those are not in MusicBrainz genre list, and not all of them are probably in my Enhanced Genre list.
So I'll see if I can find all those and add them too.
Two other observations/warnings:
There are some complications and issues with using Picard with both the CE and the Wikidata plugin.
(you would want to use both, since that gives the most and the best results)
But these two (and probably most genre related plugins) do not work perfectly together.
The results sometimes seem a bit unpredictable, and I am trying to make sense out of it.
But that's not easy or straightforward. E.g. 'Period' (and 'year composed', on which it depends) also doesn't seem to function any more when both plugins are active.
Perhaps you already know this, but The CE plugin has an 'Allowed genres' list. The idea is that only genres in that list are accepted.
So the plugin has an out-of-the-box genre limitation. There is a checkbox that should disable this filtering so that you should get all available genres.
(I have some slight doubts if it completely disables all filtering under all circumstances, but that also needs some further and specific testing)