The information on this pages relates to Next_Generation_Schema (is that right?)
Often, artists work together on tracks and albums in various ways, but it is difficult to credit them. Not only this, but some artists have minor differences in the spelling of their name over different releases, and this information has been hard to capture in the past.
Artist credits bring two main changes:
The first is the ability to link multiple artists to one release or recording, instead of having to create fake "collaboration artists". For example, the single "Under Pressure" being credited to the fake artist of "Queen & David Bowie".