The pic shows the Opus info tip contents on the left, (containing all of the MUSIC type infotip keywords.) Maybe some of the keywords are in other groups, but I couldn't find them?
On the right lister, you can see the actual result of hovering over an almost fully tagged mp3 (I wasn't able to tag either INTITIAL KEY, RELEASE DATE, or MODE).
Notice that the COPYRIGHT field shows in the metadata pane, but not in the info tip.
There are also a couple of cases where infotip keywords are not listed/shown/available? in the metadata pane ({mp3 info} and {mp3drm}).
There are several other MP3 frames that are listed in the metadata pane, but are not available as keywords in the infotip.
WOAR
TCOM
TPE3
TIT1
TMOO
TPUB
TIT3
It would be good if these anomalies could be addressed, and it would be mighty helpful if the manual listed the mp3 keywords alongside the actual mp3 frame name, that way you could simply look at the manual to see which word reference which frame, because it isn't always clear by looking at the Opus keyword.
Also, it would be nice to have MEDIA TYPE [TMED] as a keyword please
Copyright is a field that applies to lots of file types, not just mp3s. Looks like something isn't hooked up there, which we'll fix.
Mp3Info is a field that shows a combination of other metadata. It would not make sense to show that in the metadata panel.
The metadata panel only shows select non-editable metadata. For better or worse, it is intended as a metadata editor more than a metadata viewer, although it does show a few read-only fields for convenience. MP3 DRM is not one of them.
Some MP3 fields are indeed only in the metadata editor and not available as file display columns or tooltips. We can look at adding them in the future. I think it's the first time anyone has asked for them but they're easy enough to add (but not right now because they'll need translating into different languages, which will have to wait).
Are you really using tags like "mood" and "content group" on a daily basis, or is this more of an academic exercise?
Copyright - check
MP3info - yeah, I realise this, I mentioned it only for completeness.
Metadata panel - See above, but some of the fields I mentioned seemed as if they should be available as keywords in the info tip, if only because the info is already being parsed from the file by the metadata panel anyway.
Not a chance I am using mood or content group, on any basis let alone a daily one. Again, I only included these because I wanted to show that the 21 keywords available in the info tip, did not line up with the metadata pane, so it was partly 'academic'. However...
Jon already added TENC, which is one I use.
Others that I would use, and would much appreciate being added are...
Media Type [TMED]
Publisher [TPUB]
Composer [TCOM]
These are all practical additions, rather than academic ones
I am very pleased to see all the above fields added as keywords in the info tip. I do use some of them in a daily basis and the availability of them will be of great help to me.
I will appreciate if "content group" is also included in this effort. I do use it in a daily basis as well