The higher court ruled that KHJ negligently created an undue risk to the public by causing a situation in which its listeners were encouraged to race on the roads, and that there was sufficient evidence for the jury to find that the contest's risk of harm to the public (including Weirum) was foreseeable. End of an era The format brought high ratings to the station until the late 1970s, when FM radio became the dominant form of music broadcasting. In November 1980, during Bob Shannon's show, and after the song "Rock and Roll (I Gave You the Best Years of My Life)" by Mac Davis was played, KHJ switched from top 40 to a country music format with the slogan "We all grew up to be cowboys". The change attempted to capitalize on the rise of pop-driven country, a trend driven in part by the film Urban Cowboy which was released that year. However, that format lasted only three years. On April 1, 1983, KHJ switched to an oldies format: "The Boss is Back", featuring the original Johnny Mann Singers' Boss Radio jingles. In 1984, KHJ launched "Car Radio 93", a top 40 variant targeted to commuters, featuring traffic reports every ten minutes. On the evening of January 31, 1986, "Car Radio" DJ Dave Sebastian Williams was joined in the studio by Robert W. Morgan. Participants in KHJ's Boss Radio heyday (DJs M.G. Kelly, Bobby Ocean, and Jimmy Rabbitt, and program director Ron Jacobs) phoned in for a farewell broadcast, playing the songs which had made KHJ a popular AM station in the 1960s and 1970s. The last song played on KHJ was "Rock Around the Clock" by Bill Haley & His Comets. On February 1, at Midnight, the station adopted new call letters KRTH to match those of its FM sister station and a format known as "Smokin' Oldies", featuring hits from the rock and roll era's first decade. The station used "AM 930" as its moniker. With the format change, RKO General dismissed about two dozen staff members from both stations. Switch to Spanish and call-sign problem RKO General had been under investigation by federal regulators since the 1960s for unethical conduct at its television stations, including KRTH's television sister KHJ-TV. The company was eventually ruled an unfit broadcast licensee and was compelled by the FCC to sell its broadcast properties. In January 1989, RKO sold KRTH-AM-FM to