Not long after its debut, Love was dropped in favor of live, locally programmed freeform rock music at KLOS and its FM sister stations. In 1971, the station adopted the KLOS call letters to avoid confusion with its AM talk station. In late 1971, the freeform progressive rock sound ended, as Shaw and KLOS program director Tom Yates launched the first album-oriented rock (AOR) station in the United States. Under AOR, KLOS played only the top tracks from the best-selling rock albums and used the slogan "Rock 'N Stereo". The initial slate of disc jockeys on KLOS includes Jeff Gonzer, J.J. Jackson, Jim Ladd, and Damion. By 1972, KLOS had become the top-rated FM rock station in Los Angeles. The station promoted an outdoor rock concert called "California Jam", held April 6, 1974 at the Ontario Motor Speedway in Ontario, California.