And how were KFRC and KHJ doing in the ratings and in billing during those under-200 and under-100 song years?
I can't speak to billing. In terms of ratings, KHJ had been in trouble for a while. John Sebastian was brought in to try to right the ship.
The station had a 3.3 when he arrived, he delivered a 3.6 with this approach (doesn't sound like much, but it was KHJ's best number in a year and better than all other stations in L.A. playing contemporary music, AM or FM), but it didn't last. The trend from there was 3.1-2.7-2.3 and John was gone.
His replacement, Chuck Martin, took the library back to "normal" levels and saw 2.1-1.8 and then, after KTNQ went Spanish, a bump up to a 2.4.
It worked a lot better at KFRC. Gerry inherited a 4.5 and went 4.8-5.4-5.4. That was '81. '82 was dicey---4.5-4.2-5.0-3.7, but that 3.7 was good for 3rd overall in the market and number one music station.
1983 went 4.1-4.2-3.9-3.0, but by that point KFRC had a chunk of FM competition from KSOL, KIOI, KYUU and KITS.
They inched up to a 3.1 in the Winter book and Gerry was gone, replaced by Mike Phillips, who'd been programming KYUU. He went very traditional mass-appeal top 40 with a much bigger gold library. And his numbers for the three remaining books of 1984 were 3.4-2.6-2.7.
It's worth remembering, though, in both cases you're dealing with AM stations in decline with FM on the rise. Would either of those approaches have worked better---or longer---if they'd been tried on a full market signal FM?