sentences:  FM stereo broadcasting was added in 1975.Eventually the AM and FM signals switched roles, with the 50,000-watt stereo FM signal becoming the primary station and AM 1090 becoming the simulcast.The simulcast ended in April 2001 when AM 1090 changed to a news/talk format, eventually taking the calls WKBZ (which one belonged to one of WMUS' biggest competitor stations).