For all tracks released after January 1st, 2016, you must complete at least one set of performer data—per track—in order for us to collect your performance rights royalties.
A "complete set" of performer data includes a performer's “type” (primary, featured, or non-featured), the performer's legal name, and the performer's audible role/instrument performed during the recording of the track.
Track performers are not currently displayed at digital service providers like iTunes or Spotify.