Yelawolf keeps it country on “Throw It Up,” one of the highlights off his Shady Records debut Radioactive (Nov. 21). The Alabama rapper links up with former Three 6 Mafia member Gangsta Boo (“Not Nicki, I’m worser, I’ll hurt ya”) and his label boss Eminem, who steals the show with his spitfire rhymes. See how they do it in the South.