davidtgoh:
Don't know if this will be much help, but I am very "Playlist" oriented. So here is what I do.
To the questions:
1. I believe MPD recognizes ID3 tags with the exception of the album art which has to have a specific name; In my case it is folder.jpg. In my ID3 tags ( created in DbPoweramp ) I only use Artist, Title, Album, Track, Year, Genre, Album Artist & I use the art which is in the same folder with the music tracks.
2. The folder tree in my library is... Genre / Artist / Album. In the case of Classical the artist is the last name of the composer; Same in the tags. I name the tracks with the track number prefixes 01, 02, 03 etc. The track names in my ID3 tags do differ in that they do not include the track number 01, 02, 03 etc. This may have been a mistake as MPAD gets the track order wrong on one of the search options; Can't remember which one, but I can live with that for now.
3. Not sure about this question. But what I do is create playlists in MPAD then save them in MM. After that initial playlist creation process I may add new tracks, when I'm at the computer, using MM. The Playlists I create for classical are performance type based: Ballet, Cello Concertos, Choral, Concertos for Orchestra etc...
As far as comparing different performances of the same piece, I usually do that by creating temporary playlists on MPAD. For the most part this is done to decide which performance will make it into one of the permanent playlists. Though I do see some value in making some competitive playlist permanent though.
One MM glitch that is easy enough to work around may not be something that happens in every computer / browser setup. In my case with XP and Chrome when I add a track to a playlist using MM then attempt to move it into the correct alphabetical location the sequence number does not change and the new track ends up back at the bottom of the playlist. My work-around in MM is to... add the track, "Save" the playlist, "Clear" the playlist. Then within the BDP network window open User / Playlists, right click on the playlist you just saved and open it in WordPad. At the bottom of the WordPad doc you will see your new track. Cut and Paste it to where you want it then click on the Save icon at the top of WordPad. That's it.
Hope this helps. Rich