I would like to be able to browse my music collection as though it were a bookshelf of CDs. For classical, I would organize it by period (genre in the itunes world) and then by composer. A library item that appears in Sonos as an album "The Sound of Austria" or the name of some obscure performer (Sonos' artist) - are both useless, and the music is inaccessible for practical purposes. A more useful presentation would be, Composer|Work, for example, "Mozart"|"Symphony #41".
I have 'fixed' this issue by redoing the iTunes Artist Field to contain Composer|Work, but that is tedious.
If Sonos were to permit the Library presentation to use or combine one or more user selectable fields from iTunes, that would greatly simplify the task. However, that solution is complicated by the fact that what works for one genre may not work for another.
So here's another suggestion: In addition to browsing the Sonos Library by Genre, Artist, Album, etc., there could be another possibility - browsing by a user created field. So if I were looking for classical music, I'd use the Composer|Work choice; if I wanted to browse my jazz, I'd select the existing Artist presentation.