Hear Slaughterhouse's Knockout 'Southpaw' Track 'R.N.S.'

The Eminem-curated Southpaw soundtrack doesn’t hit shelves until July 24th, but on Friday, Slaughterhouse let loose “R.N.S.,” another track off the Shady-fueled compilation for the boxing flick. Joell Ortiz, Joe Budden and Crooked I – but no Royce da 5’9″ – reteam on this blistering Just Blaze and AraabMuzik co-production which opens…