> My plans right now is to extend the possibility to store tags from local
> files and make them browseable. A lot of files in my collection have
> mood tags, some files have as much as 10 moods stored, so your solution
> to create a library per mood seems unfeasible.

Why would this not be feasible?

If you don't want to flood your music menu with those items, your plugin
could provide an additional "Moods" menu item under which you'd have the
various moods?