Lady GaGa Explains Her Absence on Kendrick's LP

On her website, Lady GaGa explains being absent on Kendrick's LP.

I apologize to the fans that this situation with Partynauseous is confusing. To it clear it up I must explain this. When I collaborate with an artist i work solely with them, not with their camps or management. Its purely organic and creative. I love Kendrick dearly as a friend, but was not willing to compromise musically to the changes his team was making to my music. This is why I am not his record. I have a very specific vision as a producer and songwriter, and I always have. That song will be released at a different time, for a different project. I love you, and think you should check out his stuff because he is truly great. He’s a good kid, its just sometimes a mad city. -LG

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Artist Label: Kendrick Lamar, Lady GaGa