After breaking through as a troubled, pistol-packing 16-year-old with hard-angled bangers, Chief Keef has evolved his Chicago drill sound into something more bleakly beautiful. On Thot Breaker, the rapper forges a set of distorted sounds (the echoing keys and Auto-Tuned flows of “You & Me”) and daring electronics (the cascading synths of “Whoa”). On “Can You Be My Friend” he changes things up even further, as he jumps on a dancehall-flavored beat and recites some lyrics from TLC’s “No Scrubs.”