Eminem - Kings Never Die (Ft. Gwen Stefani) + Bonus Track!!! From Southpaw Soundtrack (2015)

Southpaw: Original Motion Picture Soundtrack is the official soundtrack to the 2015 movie Southpaw. The album, performed by various artists, was released under Shady Records. It spawned the single "Phenomenal" by American rapper Eminem, and another single "Kings Never Die" which featured the guest vocals of Gwen Stefani.

Aside from the "Kings Never Die" single.. I managed to find another track from the album named "All I Think About" which is sung by duo Bad Meets Evil, which consists of artists Marshall Mathers aka 'Eminem' and Royce da 5'9"