Eminem has released a new surprise album, a companion to his , "Music to Be Murdered By."

The dropped "Music to Be Murdered By --- Side B," Thursday at midnight. The album, produced by Eminem and longtime collaborator Dr. Dre, also features DJ Premier, Ty Dolla $ign and Sly Pyper.

Eminem also took a surprise-release approach to his two previous albums "Music to Be Murdered By," released in January and "Kamikaze,"released in 2018.

Among the 16 new songs is a track tilted "Zeus," in which the rapper offers an apology to Rihanna over decade-old lyrics about Chris Brown that leaked in 2019. On the song, Eminem rapped that he "sided" Brown after he involving Rihanna in 2009.

The new lyrics read: "But, me, long as I re-promise to be honest / And wholeheartedly, apologies, Rihanna," he raps. "For that song that leaked, I'm sorry, Ri / It wasn't meant to cause you grief. Regardless, it was wrong of me."

Speculation that a new Eminem album was coming had been bubbling on social media all week.