Sure, but is less flawed then any individual is going to achieve, from memory your original files only contained a very limited set of metadata fields. To manually add the metadata that SongKong adds for your whole collection would take you a lifetime !
Of course you can manually edit your metadata when the metadata is not quite perfect, but I think in most cases you will find it fine. But you can also edit the MusicBrainz database itself, so if you fixed the omissions as follows:
- Remove the Album Performer relationships (as you say the performers are not involved in every track)
- Add Track Performer relationships for each track
Then autotagging from SongKong would then have the correct list of track artists and performers for each track.
I probably should have said Movement. But forget about Classical for a moment, for a PopRock song the written piece of music is a work, similarly for Classical every movement is essentially also work but usually part of a larger work , and it that case we use the terms Movement and Work , although even for classical there is often just the single work without any movements.
MB Recording Work is simply the work directly represented by the recording (the Movement in classical terminology), in this case this is then part of the work and this is stored in the MB Work field as Così fan tutte ossia La scuola degli amanti, K. 588
Well you can add it manually, or you can add it to MusicBrainz as described above. I cant see any other option, not sure what you are driving at?