Chief Keef is finally dropping off his anticipated debut tomorrow (which some of you probably already have thanks to the powers of the internet), but before Finally Rich hits shelves, the Chicago rapper is also featured on a new cut from producer Mike Will Made It. In addition, “On It” welcomes assistance from Young Scooter as the collaborative cut will appear on Mike Will’s upcoming Est. in 1989 Vol. 2.5, dropping on December 24. Enjoy below.