I belive it depends on my Mediafolder structure. (this is on size of my Collection to keep overview unchangeable, makes no sense od different Genres)
I have 13 Mainfolders as Maingenres with together 97 Subfolder as Subgenres, then folder Artist/ folder Album(s)
So Structure is for Example: Rock / Progessive Rock / Yes (Family Tree) / Yes / Studio / 2011 - Fly from here @320 and so on....
So if i click on Artist "R" it points me to Rock and stays empty (and so on)