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This is just my opinion but I'm not a developer so use with care :-) You can surely make a patch for this and put it to the tracker. But I'd say there's little to no chance that it will be committed because:
1. The tags are not standardized (as you say, and I agree), and I think the RB devs wouldn't want to stick to non standard tags
2. IIUC, every added tag significantly increases the bin size and used RAM size so only really needed tags are used
3. RB devs are not very fond of classical music, so they will probably be reluctant to addind something they don't need (there are also not many requests for this feature)
That said, I'd like to add that I would welcome such a feature since I have many classical pieces in my music collection (about 40%). But the problem is that the community (not only the RB one) has not agreed on the way to tag them. So the problem is not RB specific. See for example MediaMonkey forums on this topic.
Just as a note, you don't NEED tags to listen to music at all, so please be careful about using absolutes. Many people get by with their music organized solely in the filetree just fine, even including classical music.
Picard (the MusicBrainz tagger) suggets that GROUPING is the approriate Vorbis comment. See http://wiki.musicbrainz.org/PicardQt/TagMapping for details.
I'd say that the tag for tagnavi.conf purposes should be called 'grouping' as that's what it's doing. The word 'content' feels a bit redundant IMHO. But then again, I have no strong feelings either way since I wouldn't be using it.
As for what supporting multiple different tags, I don't see a problem with that. So long as it's a reasonable number of course. Don't forget to add the MP4 tags as well if you do a patch for this.
The same is true for ALBUMARTIST so I think I will also make a separate patch that in the Rockbox database the ALBUMARTIST tag is set to the value of the ARTIST tag of a track if the ALBUMARTIST tag is not set in the music file. With this amendement it is no longer necessary to tag ALL your files with an ALBUMARTIST tag in order to have a browse structure like "albumartist->album->title" for ALL your albums. You need then only to tag the tracks of various artists albums with ALBUMARTIST=various or of albums for which ALBUMARTIST differs from ARTIST for another reason (e.g. albums of a certain artist on which e.g. one song is a duet with another artist (all songs except the duet have ARTIST=artist1 and the duet has ARTIST=artist1 & artist2). Does that sound reasonable or are there any concerns to this additional feature? Of course, the original tags of the music files are not changed with this solution since the tags are only set in the internal Rockbox database.
I've committed code that does a similar thing to what was described in FS# 7342. That should make it easier for you to focus on your grouping patch.
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