When the tracklist for Kendrick Lamar‘s Good Kid, m.A.A.d. City (out October 22nd) came out, a lot of people were wondering where the Lady Gaga feature was. Here’s her explanation, via Tumblr:

I apologize to the fans that this situation with Partynausous 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 [on] 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