Help needed to track down inconsistent metadata setting

[haggis999]

(16-02-2021 10:27)simoncn Wrote:  It sounds like this album has at least one track that does not have Sub-Genre = Opera and/or Composer = Mozart, so you are getting a partial list of album tracks instead of a complete album. If you look through the list of tracks carefully, you should be able to see which track(s) are missing.

Both JRiver Media Center and Mp3tag confirm that all tracks of this 3-disc box set have Sub-Genre=Opera and Composer=Mozart.

One quirk of this 1990 recording by The Monteverdi Choir and The English Baroque Soloists, conducted by John Eliot Gardiner, is that the last track of Disc 2 and the last four tracks of Disc 3 are described as appendices, providing alternative versions for some sections of the work. I didn't want to automatically include these extra five tracks every time I played the opera, so the primary tracks had Work=Idomeneo, K.366 [Gardiner], while the extra tracks had Work=Idomeneo, K.366 (Act 2 Appendix) or Work=Idomeneo, K.366 (Act 3 Appendix). All tracks had the same Album name, but if I selected by Item I could see three different works related to Idomeneo.

As an experiment, I've just tried listing the five appendix tracks under a slightly different album name. I can't quite understand why, but this has resolved my problem! This opera is now presented in the same manner as my other operas via the Naim app.