On some albums, when I select “Prefer file data” for “Multi-part composition grouping” I obtain the expected compositions.
On other albums, I rather than the option “Prefer file data” I see something similar to “12 Tracks, 12 Performances”. Choosing this option does not give the expected compositions, basically I get one composition per track, which is not correct.
I believe none of my albums have Work/Part tags, and all use the same track Title format “work: part”.
I would like to resolve this problem with the latter albums. Is there any way to diagnose the cause of these “12 Tracks, 12 Performances” messages?
I discovered the cause of the problem. On the second album, tracks do in fact have a Work tag but no Part tag. I was mistaken and had not seen this before.
As an example, track 1 has Title “Concerto for two violins in D minor, BWV 1043: 1. Vivace” and Work “Concerto for Two Violins in D minor bwv 1043”. The work names mismatch, and as I mentioned, the track has no Part tag.
I think I can easily edit Work and add Part to resolve the problem. Also, simply deleting Work might be another option.
Note, on the first album Roon reports missing Work/Part information. This warning is missing on the second album. In retrospect, IMO this is a hint as to what is going on.