The Involved People field can be used to add additional people and their role, certain named roles such as Producer, Engineer and Orchestra have their own fields and by default are not added to the Involved People field but they can be by adding them with this option. Please note that in earlier versions of SongKong (before 7.0) these roles were only added to Involved People and did not have their own fields but this was a problem for MinimServer because it cannot read the Involved People field for ID3 format.