I've been saying that was GaGa. I love her versatility. It makes sense when you think about it. She's been playing with her voice for a minute... *cough* Cake *cough*
This song is great though, its one of my favorite songs right now. I'll be buying Good Kid, M.A.A.D city and I hope Partynauseous turns up on ARTPOP. I dont get the hate tbh.
"Background vocals by Anna Wise of Sonnymoon
Additional vocals by JMSN"
Anna Wise collaborated with Kendrick on "Cartoons & Cereal" and "Westside, Right On Time", so that makes sense. Oh well, I have faith we'll hear "PARTYNAUSEOUS" before "The Greatest Thing"