JULY 23, 1989—WLS-AM HAS DROPPED ITS MUSIC FORMAT, THE LAST OF THE GREAT AM RADIO STATIONS TO ABANDON MUSIC. WLS LEFT THE TOP-40 FORMAT IN 1986. UP TO NOW, ITS HAD AN ADULT CONTEMPORARY/OLDIE FORMAT. A RECENT CHICAGO SUN-TIMES ARTICLE SAYS WLS PLANNED TO BUY OUT THE CONTRACTS OF BOTH MORNING MAN FRED WINSTON AND AFTERNOON DRIVER JOHN LANDECKER. SYNDICATED HOST RUSH LIMBAUGH WOULD BE USED IN THE MIDDAY SLOT NOW OCCUPIED BY DON WADE AND ROMA.