Composition mapping

The tagger has a text processor with nifty functions to e.g. extract the opus from the composition.

If the composition is in the MusiCHI database, there is a more elegant method called Composition Mapping. This allows you to write any part of a composition straight into a custom tag.

I use this for Opus/Catalog as these are pretty powerful pieces of information to inspect  your collection for completeness.
I also use Year to order by year of composition as in case of a thematic catalog, the numbers don’t make much sense.

Settings > Tag mapping > Custom tags

Composition Map defines the elements to populate the tag.

Voilà!

Add this custom tag to the player and you have a chronological overview.