I've been using the Groupings / Work tags for this for many years. I can't recall exactly where I picked up that tip, but it was from someone else in a tagging related discussion. I use the Groupings metadata as a way to track many things. As you can see from the screenshot below.
Instrumental vs. HasVocal used in a Soundtrack Secondary / alternative genres. If Dolly Parton does a Rock album...you can label it Rock and Country and CountryRock. "Mellow" songs - slower tempo/chill Original vs. Cover vs. Re-Recording Orchestra, BigBand, Opera, (not just "Classical") Top40 - for me, that means it charted on the Billboard Hot 100. RS500 - Rolling Stone Top 500 songs list Disco, Dance (usually for R&B songs) Surf, Garage, HairMetal (usually for Rock songs) AdultContemporary - charted on the Billboard AC chart DrumSolo, Guitar - for tracks featuring these prominently etc.Groupings.png
I also have a grouping value I use to indicate I've confirmed/updated the Year field. Personally, I want the year field to hold the original release date of the track...so if it's a greatest hits album or a various artists compilation, the Year field has the original date of the track's release, and I update the album name to include the year the album was released. That looks like this:
Year Grouping.png
Note: there is an "Original Year" field, but many players don't display or support that. This is a system I've been using for over 15 years...
Hope this helps others with managing their collections.