"I was thinking of this for myself some time back, Had found the TaggTool.
Tagg only stores pointers to your files and will never change or move files. Tagg does allow you to copy files but the original file is left untouched. When Removing Tags remember that only the pointer to the file is being removed from Tagg's database and not the physical file.
But, Lately, I find Locate32 is a better way for me. The best part is -- it allows you to create databases of specific search scopes (think of it as customized 'windows search index' files).
Locate32 is software which can be used to find files from your harddrives and other locations. It works like updatedb and locate commands in Unix based systems. In other words, it uses databases to store information about directory structures and uses these databases in searches. The use of these databases provides very fast searching speed. The software includes a dialog based application as well as console programs which can be used to both update and access databases. Supported operation systems are Windows 98/ME/NT4/2000/XP/Vista."
"I'd like to find a media manager that does this correctly, the problem is either you store the tag information in the ID3 tag or you store it in an external library. If you store it in ID3 tags, it has a good possibility of getting clobbered by all the media library software out there (Winamp, iTunes, etc). If you use an external library, then, more often than not, the file path is used as the identifier, so if you rename your mp3's or sort them, then you loose the tags.
I think it would be cool if a new field was implemented in the ID3 as a standard for tags, and all media players would implement and use this field consistently.
However, as it stands now, I don't know of any software that does this. I would like to know if there was."
Well, for what regards winamp: why not using any of the unused ID3 tags? I mean: you could use the "Composer" or "Publisher" fields to write whatever you want... and then find anything from within winamp.
"with foobar2000 you could use multiple tags in one ID3 tag (separated by "";"") and show them like you want using title formating with %<""field"">% (Default UI components: album list / facets or Columns UI components: album list panel / filter, ...) and commands like $meta(field) (everywhere)
More info here
Note: by default only the tags: ARTIST, ALBUM ARTIST, PRODUCER, COMPOSER, PERFORMER, GENRE are configured for settings by multi-tags, but you could add yours (like MOOD, STYLE ...) in: Preferences > Advanced > Display > Properties Dialog > Multivalue Fields"
