Directory structure for Classical Music Albums etc.

[DavidL]

I faced this dilemma some years ago when I started transferring my (mainly classical) music from CD to computer storage. Because I anticipated the library would continue to grow like you I chose Genre as my top-level for organising the library. To keep individual genres reasonably small I defined several genres for classical music: Classical - Early, Classical - Baroque, Classical - Classical etc etc. I also decided to use the 'album' tag as 'classical work' as many CDs include works by several composers, so I split the albums accordingly.
When deciding on which program to use to curate the library it is important to appreciate that they are all working with a 'flat' card type database structure i.e. Artist > Album > Track. It is the software that does all the searching to form lists in the fashion the user requires.
I'm not familiar with SongKong so cannot comment on its merits but because of the effective anarchy in the way classical music is tagged by the originators some personal intervention to impose some standardisation for a library is inevitable. It is a matter for personal judgement what is the most efficient way to tackle this.
I solved the problem by editing the meta data as I acquired each new CD. I have found iTunes a very robust and efficient tool for curating my library (but not for playback). Unfortunately Apple has just dumped the fully-featured iTunes app with the release of their latest (Catalina) operating system. You are OK if you have a PC though. I'm going to stay with the Mojave operating system on my iMac.