In Pop/Rock there is usually a single performer or band who is credited. They are often the composer of the song as well but if they are not the details of the writer are not usually so important, the artist
credits on the release itself make it clear who should be credited for each track.
But in Classical music, usually various performers, an orchestra or choir, a conductor and a composer are all credited. This means we potentially have a long list of people credited for each track, and we don’t have an accepted order they should be added in.
Years ago the composer was often used for the Artist field, but as the Composer field is better supported in most players (such as iTunes) we usually we no longer need to add the composer to both the Artist and Composer field. In fact doesn’t really make sense to add the composer to the Artist field any longer for Classical music because often the music was composed many years ago and they were not involved in the actual recording in any way.
The default for SongKong is to store the Performers, Ensemble/Choir/Orchestra and Conductor in that consistent order, but we offer different masks for different uses.