In Classical, there is not just the usual matter of sorting by artist and title. Any serious appreciator of this genre has to deal with:
- solo artist
- solo artist's instrument
- chamber group, if applicable
- orchestra, if applicable (either alone or to accompany soloist)
- conductor, if orchestra in effect
- composer
- name of parent work (opera, suite, sonata, concerto etc.)
- name and number of next sub-division (act, movement)
- name of next sub-division (scene, aria, variation)
So, as you can see, certain types of music just don't lend themselves well to the
usual limits of ID tags.

Yes, there are a select few who are depraved enough to put Wagner's Ring Cycle on their MP3 jukebox. I'm not quite at that point, but one can never tell...
