Hai,
the idea to chuck it on github was to be able to cooperate

So thanks for the request!
But at this point I would refrain from adding new genres to the 2 'MusicBee' sets, as these (i.e. MusicBee_2Layer.txtm & MusicBee_3Layer.txt ) should be based on the genres that always shipped with MB & were defined within MB 'Configuration.xml'.
So I will probably deny the merge into those atm, but I'll take your alphabetical order fixes you've added, and up a version with those (might take me a bit, as am a noob in github land as well... so this endeavor is meant for me to learn the official github ways some more as well. So next is - learning merge requests, and how to cherry pick changes, which I will try today or tomorrow on these - so don't remove the request yet please!...), but dobn't really want to add any new genres at this point as then it would become a personal/subjective variant of the original MusicBee category/genre definitions...
But, your edit would be great to have/keep as well!!
But imo this then should sit under a new name as
your variant of those maybe... (?)
So maybe add them as
MusicBee_2Layer (zkhcohen version).txt
MusicBee_3Layer (zkhcohen version).txt
or somesuch ?
Churs.
c.