During Big Boi‘s set at a pop-up concert for Atlanta radio station V-103, Killer Mike joined the OutKast member on stage. They performed a brand new song from Big Boi’s forthcoming album, which also features Jeezy. Back in December, Big Boi revealed that his album was 80% finished, and that a Gucci Mane collaboration will be included in it. The album has been finished by now; Big Boi had since announce its completion. In addition to this, Big Boi revealed that he and Killer Mike were working on a joint EP back in August last year.
— Big Boi (@BigBoi) March 26, 2017