It's important to note that in the 50's and 60's when most buyers followed Pulse and Hooper there was either no age break data or very limited information. While Arbitron began in 1965, it was not dominant until the early 70's when it made the "Spring" and "Fall" sweeps uniform nationally.Those are 6+ numbers, though, and by the end KABC was skewing quite old. Even before the noise floor, migration to FM in Los Angeles was a big factor. By 1983, the only AM stations doing well playing music were KMPC and KPRZ, playing standards. Anything else where the same music could be found on FM was dead or close to it.
And by the earlier 70's, we had started to see FMs growing so when demographic data appeared, it was obvious that the younger listeners had all migrated to FM or were in the process of doing so. FM achieved parity with AM in LA around 1979/80, a little behind most other markets, but by then non-ethnic music listening was about two-thirds on the FM band. And music listening was half on FM by about 1977.
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