landtuna said:
An auditorium of 100 people would be there to sample music of a specific genre, not all pop, rock, country etc., so the "3%" of Oldies isn't a true reflection. If an Oldies station wants to sample their genre everyone in the auditorium would be reflective of potential Oldies listeners.
A music test for a classic hits station will include listeners to classic hits radio station(s) or people who like "that kind of music". A typical recruit specification for such a station would likely start with: persons 35-54, 50% male 50% female, probably some ethnic control in markets with high percentages of Hispanics. Usually, a question about stations listened to and the amount of listening would be done... something like the classic hits station being among the top 3 most listened to stations and getting an average of 5 to 8 hours of listening a week.
There you have a basis for testing songs: people who listen enough to know the songs and like them, people in the age and gender mix the station needs, and enough ethnic control to mirror the market and the appeal of the format.
If the issue is that a station has been underachieving, a recruit will be done based on playing four, five or six different "pods" (snippets of 5 or 6 songs that represent a style) will be played. All pods will be in-format, and if the potential recruit indicates strong like for half or more of the pods, they get invited to participate. That way you get people who like a lot of the music yet may not be listening because the station sucks... you get people who will tell you what to play to fix it.
And I also don't follow your "smoke and mirrors comment related to 60's and 70's music.
The "smoke and mirrors" comment refers specifically to things like record retail and one-stop shenanigans, payola, turntable hits to balance a playlist, etc. All these common practices caused the charts to be less-than-perfect reflections of reality.
The lesser know element to these record label gambits was at the retail level. Many stations called record outlets for sales reports. So record labels would give stores free copies of songs they wanted reported as "top 10" or "growing fast" by the stores. Or they gave them more copies of a true hit product. Or they allowed a higher percentage of returns on their label... whatever the incentive, stores reported higher sales of songs that, often, were stiffs.
While there have been, historically, only a handful of payola indictments, the practice was enormously common. And in the 60's and 70's, it was pervasive. Payola produced airplay, and airplay caused songs to climb the charts... but many payola-induced songs were not hits.