Harper, John WXYZ: AM programming, program director. Format Changes Billboard, August 10, 1985, Page 18 1 … Jim Davis, formerly of Detroit stations WXYZ, WJR and WOMC… 2 WXYT program director John Harper concurs… 3 Google Books, Billboard, August 10, 1985, Page 18Google Books, Billboard, August 10, 1985, Page 18Google Books, Billboard, August 10, 1985, Page 18 References: Motor City Radio Flashbacks, CKLW Makes Upward Surge for Radio Ratings, August 10, 1985