The Primary Artist is the main artist who is performing on a track or album.
Every album or track must have at least 1 Primary Artist.
When submitting a new album or track, you must list the main performing artist on the album or track as the Primary Artist.
Alternatively, if there is a guest artist on the track that is performing, you can submit them as a Featuring Artist. However, if the Primary Artist at the album level does not perform on that track, then the Featuring Artist should actually be the Primary Artist for that track.
You cannot submit a Primary Artist or Featured Artist on an album or track if they do not perform on the track (Because...that wouldn't make sense).