How to organize and tag classical music

[Leon di San Marco]

Thank you Simon!
Audirvana, as far as I know, doesn't give the possibility to add custom names. So I tried with aliasTags and I wrote "ContentGroup:Group" the way you did, without spaces and it didn't work
Anyway, Metadatics also calls it "Grouping". Are we sure we're talking about the same thing? By "grouping" I mean the tag which shows the name of a Symphony, a Concerto and that contains more tracks (example: Grouping=Symphony No.1 Op.21; Tracks 1=1.Allegro con brio;Track 2=2.Adagio and so on).