I personally think it should be the lead artist, but maybe I'm biased as I know the lead artists and got full marks. If Pharrell Williams is going to be accepted, so should Nile Rodgers as he featured too.
18/20. Pretty good, but I am confident this will be the last decade for which I know the hits. I know some of the names of the big artists now, but I don't know their songs. Recently learned Bad Bunny was the most streamed artist on Spotify for three different years in the 2020s. I don't even know the name of a single song of his. Oh well. Time comes for all of us.
Might I suggest accepting Rhianna as well as Eminem for Love the Way You Lie.
Also be a little more lenient with Iggy Azalea spelling. That one drove me crazy lol
But maybe its possible to accept Pharell for Get Lucky, that had me :