 In the 1960s and 1970s, WIBM served as the Jackson area's Top 40 music station.Casey Kasem's American Top 40 was heard on WIBM throughout the 1970s.In 1980, the Top 40 format was moved to its FM sister at 94.1 (now WWDK and no longer co-owned), and the AM station became WXCM with a country music format which continued until 1987, when the station went back to the heritage WIBM calls and became a simulcast of the oldies format on 94.1 WIBM-FM.