All right. You've convinced me.
There are only 40 songs in the entire history of music that anyone likes, and everyone alive likes only those 40 songs, and they don't like any other songs. If you limit your radio station's playlist to just those 40 perfect songs that everyone in the entire world thinks are the greatest songs ever written, then you'll get every single listener within range of your transmitter to tune in to your station, and they'll listen 24 hours a day, seven days a week. Advertisers will shower you with contracts, and you'll live in a big house with a beautiful wife and an even more beautiful girl friend.
But, if you should ever play so much as one single song that isn't on that magic list of 40 perfect songs that everyone in the world agrees are the only 40 songs worth listening to, then everyone will tune to a different station and your ratings will instantly fall through the floor and you'll go broke and have to live all alone in a cardboard box under the bridge.
Likewise, your staff of "live and local" disc jockeys are the glue that holds your 40 song station together. Without them, no one would listen to those 40 perfect songs that everyone in the world agrees are the only 40 songs worth listening to. However, those DJ's are so incredibly stupid that you cannot trust them to decide what order in which to play those 40 perfect songs, so you have to hire an outside consultant to tell you the order in which to play those 40 perfect songs that everyone in the world agrees are the only songs worth hearing, because if your brain-dead disc jockeys were to play the #5 song before the #31 song instead of before the #21 song, then your listeners would all change the station and your ratings would go into the toilet and you're back in the cardboard box under the bridge.
I was wrong to think that in a city of over 1,000,000 people, there might be some differences in musical taste out there. How stupid of me to not realize that when experts like you describe the "mass audience", you know that every last man, woman, and child who lives within the range of your station's transmitter has exactly the same taste. And I should have realized that your knowledge that their preferences in songs never, ever changes no matter what mere external forces might influence their lives is far more expert than what my meager life experiences might have taught me.
And I was totally wrong to think that how people like or dislike songs is expressed in variable degrees, or that there might be songs that people like hearing often, and others that they like hearing every now and then. You've opened my eyes to the realization that all people either absolutely, positively love a song, or that totally and completely loathe it, and any suggestion on my part that there might be some level of middle ground between those two extremes obviously proves that I don't know music or people very well.
After all, anyone who pretends to be a pompous British twit must be an expert whose judgement is beyond questioning.