Roscoe left WNEW-FM in 1970. No rock station on FM had ratings that early!When Rosko was at WNEW, they didn't have good ratings. After he quit, things got better.
Tom Donohue died in 1975, and that's when they brought in consultants at KSAN.
Not right away. Donahue was GM of KSAN and when he died, the station retained the structure that Donahue put in place for several years with top flight ratings. Not sure when the consultants came in, but -- like at WMMS in the late 70s/early-mid 80s -- they didn't seem to have much impact on the music programming at these stations, which is the subject at hand.
How do you think a song by a new artist becomes a hit? A breaker station takes a chance, makes some local noise, other stations see the action in the trades and jump on the artist. WMMS famously took a chance on Heart and Rush when they were unknowns on Canadian labels. The action in Cleveland was so strong, that they both got signed to American labels and other stations started playing them. Both acts became big. That's how it used to work and it was exciting.Consultants never pick the music or tell stations what to play. But the labels work nationally, and so do consultants. That's where the strategy comes in. To have a local hit in Cleveland is OK, but the real money is when ALL of the stations are playing a song at the same time. That's the power of a hit song.