Customization

JRMC is very flexible
You can define your own tags and very important, MC14 stores them in the audio if possible
You can configure the tree including creating your own view.

Etc.

Custom tags

I made a custom tag Opus.
Here you can find how I populate it.

MP3Tags proves that the tag is written in the audio indeed.

Custom view

Made a custom view Opus

 

First the composer then per composer the opus number.
Per opus the composition and per composition the performers

 

Gives you a nice overview of all the works you have.
It also allows you to inspect the spelling, if you have more than one work per opus, they differ in spelling or one assigned the wrong opus number.