Composer list in library browser

[raindog]

But this gets back to my vague notion of a user-configurable Library panel:  jazz aficionados could similarly filter for "jazz" and display subgenres (about 1/3 of my collection is jazz, as it happens); world-music fans similarly, etc. Whether it's one all-purpose panel which allows me to choose the tags to present in columnar format or several genera-specific panels is a matter of taste (and coding complexity, of course).

Agreed. The best way should be to have a possibility to define multiple libraries (based on some criterion, like files location or tag) and for each of the library to define set of filters.