Although Kanye West’s new album, Yeezus, is set to drop next week on June 18th, the Chicago rapper is still making last minute changes, due to the fact that he wasn’t with happy with some early releases receiving mixed reviews, and has the executives over at Def Jam losing their minds.

As reported by the NY Post’s Page 6, last week, with just about two weeks before Yeezus was set to drop, Kanye brought in legendary producer Rick Rubin to help lay down additional tracks for the album.

With Kanye bringing in the producer for some last minute changes, Rubin will be listed as executive producer of the album.

Sources also told the Post that Def Jam execs spent last week negotiating over rights for a vocal Ye used on the track “Onsite” as the G.O.O.D. Music rapper sampled an old vocal track from a Chicago kids church choir, and label lawyers had to track down the choir director and members of the Holy Name of Mary Church choir on the South Side of Chicago to get clearance for the vocals.

Since Def Jam execs were unsure that they could get the sample cleared in time, they had producers bring in another choir to re-record the vocals. And with all the work label lawyers did trying to get clearance, Ye threw the original vocals out the window, and just the past Friday, decided to just roll with the re-recorded vocals.

As previously reported, Kanye West headlined the Governors Ball Music Festival 2013 in NYC and performed new music from his upcoming album, Yeezus.