I am new to all of this, and It seems that there is no official organization that maintains the ID3 standard. so who decide to set a "Tag" Field so developers would add support to their apps for those tags.
I have been struggling with memory issues, and having different "keywords", "SearchTag" or just simply "tags" will help me find the song or audio file in mind. I can't believe it doesn't exist. why it doesn't, maybe because people remember the title of a song, but sadly it is not possible for me.
Music is what calm me down, what take me to another world., and memory works in a weird way, I would set and remember a song but I don't remember who sung it, what the title is.
and I don't think a general tag field for search is just good for music, you might have a audio file that you want to add keywords to it, so it will help you find it easier instead of a long file name. most file explorers or music player don't use comment or description field for their search index.
You can add as much Tags, "Keywords" or "SearchTag" fields to your music tracks as you want.
The problem remains the same:
All the App developers are using the de-facto standard fields from id3.org.
Sorry to say, but I rate your chances to get some "Keywords" added and supported by nearly all apps, players and devices out there at practically zero.
Another idea:
Maybe there are some Music Management Tools out there where you can add such additions and then search in this 3rd-party-app for your "Keywords". This app would then save your information in its own database, not in the tracks itself.
As far as "Keywords" are concerned, it will be difficult to achieve this with most players if you are using a mobile app. These have very limited tag field support as these are designed to be as efficient as possible.
For computer applications, these are a bit more robust. Players like Foobar, MusicBee, iTunes, etc can all use a search function to look globally within all of the tags, or just focus on the ones you specify. So a keyword in these applications won't be required anyhow. Only the typical "stanard" ones like Artist, Album, Title, Albumaretist, Genre, etc. are used in most cases.
And of course as it relatea to mp3tag, the filter is very flexible and allows you to search in almost any and every way you can think of.
The attempt to introduce new features to an otherwise not any more maintained standard looks to me like a vain effort.
PODCASTKEYWORDS is a valid id3 tag field (TKWD) - it would be up to you to find a player that supports this field.
If such a player is hard to find, even though it is a field from the old standard, I would think that the support for new fields would be even more scarce.
