Chief Keef (born Keith Farrelle Cozart in 1995) had been charged with waving a gun at a cop and was posting music from lockdown: simple yet booming trap tunes full of matter-of-fact violence spit by a menacing voice with a gift for catchy repetition. The day that a 16-year-old Chicago kid was freed from house arrest in 2012 was the day hip-hop shifted on its axis.
