CBS Radio pulled the plug on KFRC-FM’s oldies format at 10 a.m. today (Sept. 22) and replaced it with a “Rhythmic Hot Adult Contemporary” format (think Madonna, En Vogue, Destiny’s Child) in an attempt to draw younger listeners. The switch comes a couple of days after the summer Arbitron ratings came out, showing KFRC’s audience had continued to shrink despite a format change last year when the station switched from a 50s-70s format to 60s-to-80s music. For the record, the last song KFRC played as an oldies station was Don McLean’s “American Pie,” which ended at 10:03 a.m. The new “Movin’ 99.7” began immediately with “Gonna Make You Sweat” by C+C Music Factory. No word yet on whether any of KFRC’s talent will be retained. KFRC, which switched from AM to FM a few years ago, had been an oldies station since the early 1990s. In the 1960s, 70s and 80s, it was a wildly successful Top 40 station led by morning man Dr. Don Rose from 1973-1986. The station operated today without live announcers. The switch leaves KFOX 98.5 as the closest thing to an oldies station in the San Francisco market.