What is a primary artist?

A primary artist on an album or recording is an artist that is tagged as non-featured. A primary artist can see the album on their profile, and the streams from primary artist tagged songs count towards monthly listeners. A featured artist on an album has their song in the Featured part of the DSP page and the streams do not count towards monthly listeners.
 
You can set up to 5 primary artists on a recording and on an album.