MusicIP did some matching between the MusicBrainz data and Wikipedia in order to find artists inside MusicBrainz that didn’t yet have an AR link referencing their Wikipedia page. Brian Freud then went and created a set of pages that make adding these links a snap.
Now we need more help picking up a section of the list and going through each of the listed artists and adding the ARs. If you’re interested in helping out, please take a look at the wiki page that coordinates this effort.
Thanks!
MetaBrainz Blog 
I just finished another one. Still about 20 or so lists to go, but they only take an hour or two each depending on your browser-fu, and how much effort you want to spend filling out extra data (like date of birth, extra artist relationships, and so forth).