There are many ways to tag classical.
Just some suggestions.
In the file system I made a dir C:\Music\Classical
As you might have guessed, all classical is in this sub-dir.
The advantage is that you can use a simple rule in a view like
File name starts with C:\Music\ClassicalThe advantage is that you don’t have to rely on the genre tag
You can populate it the way you want without having to adept the view each time you add a new value.
BTW: JRiver has some powerful options to move files.
For composers I use the Composer tag.
It is a standard tag and although a lot of media players don’t use it, support is improving. It is even supported on my smart phone.
Albums is the problem. Often works are combined e.g. 1 violin concert by Prokofiev and by Shostakovich. I solved this by creating a custom tag “Work” but as this is a non-standard tag support on other players (and DLNA) might be a problem.
An alternative is to create a custom tag Album-Original.
Copy the album tag to it so you preserve this information.
Then split the Album into compositions.
A bit more detail can be found here:
http://www.thewelltemperedcomputer.com/SW/Players/JRiver/Classical.htm