The format evolved into an adult contemporary sound in the fall of 1977. At some point after that, the WFIL studios were relocated to Domino Lane in the Roxborough section of Philadelphia; they moved into the building of FM station WUSL, which WFIL owner LIN Broadcasting had acquired in late 1976. Growing competition from FM stations in this period did serious damage to WFIL's ratings. In September 1981 country music was tried, but this failed to reverse the downward trend. The station switched to an "oldies" format in September 1983, called "The Boss is Back," with a new line up of "Boss Jocks," playing the hits of 1955 through 1973. This format lasted until April 8, 1987, when new owner WEAZ Inc. discontinued locally originated music programming in favor of Transtar's "Oldies Channel," a satellite-delivered service. The end of live programming was marked by a production piece consisting of a portion of the song "American City Suite" by Terry Cashman and Tommy West interspersed with old WFIL airchecks. The "Epilogue to WFIL" was produced by Charlie Mills, who at the time was working cross-town at WPEN, and had been an avid fan of WFIL during his teen years.