What function does GROUPING serve in Roon

[Mike_O_Neill]

I have found in loads of files a Tag [Grouping] , it is mostly set to the same as Composition in cases like a Symphony

In other cases it is set to a collection say Bach’s 6 French Suites BWV.X - BWV.Y

Does Roon use this tag , and what else is it used for , more importantly where does it come from ?

[CrystalGipsy (Resisting the flow!)]

It’s a standard id3 tag.

From MusicBrianz

A quick Google

It appears to have originally come from iTunes.