So that now makes it:
Lady Gaga- Do What U Want (feat. R. Kelly, Rick Ross, Christina Aguilera, Lorde, LaToya Jackson) [Produced by DJ WhiteShadow with the recycled beat drop from Jewels N Drugs (Live Version from Swinefest)]
He added a bass line to an Infected Mushroom song, took an entire instrumental from a previous demo and only produced one original song for ARTPOP though.
I really don't like Gaga and I love this song, it's her best single since Out of Control."