There are really two problems which lead to the difficulties in classifying classical music works and recordings which are discussed in this thread.
1) The structures which are built up in iTunes (and then paralleled to some extent on the iPod) are based on data from tags in the music files (MP3 or whatever). This data is not structured enough, in my opinion, to allow an optimal solution in iTunes. iTunes mirrors these tags (largely) but the data really calls for more structuring, e.g. composer -> {composer1, composer2, ...} -> {surname, other names, dates, birthplace, etc.} and similar hierarchical structures for artists, and so on.
There is also the problem that the iPod does not display all the data one might want, composer, artists or whatever (and, anyhow, the
Gracenote database often has all the details muddled up). This is, I think, what
bachlover complained about and then showed how he/she envisaged a better solution.
2) I don't really want to create my music library in the way you suggest,
LoisPallister. Once I have imported music into the library from any source, disc, Internet, or whatever, I have no longer any interest in the original source, so I don't want to create playlists which reflect a numbering of the source discs, for example.
What I want is a "database" where my music is accessible via queries specifying the composer and/or the work, perhaps sometimes the artist(s). Really what I have in the back of my mind is
The Classical Catalogue (of fond memory) from
Gramophone Magazine (the last issue I have was from 1990). That had composer, artist, opera and concert (i.e. collections) indices in a system which I found worked well. I feel that a similarly structured system must be possible on a computer nowadays.
Sadly, we have been landed with software which, though it isn't bad, is far from optimal, particularly for classical music. Here I personally find iTunes much more important than what is displayed on the iPod. The iTunes library is the centre of my musical universe; I can live with the iPod restrictions, more or less, frustrating though they might also be.