Back in the 1950s, Frank Sinatra said, “Rock 'n Roll: The most brutal, ugly, desperate, vicious form of expression it has been my misfortune to hear.” And also “Rock ‘n’ roll smells phony and false. It is sung, played and written, for the most part, by cretinous goons. And, by means of its almost imbecilic reiteration, and sly, lewd and in plain fact, dirty lyrics … it manages to be the martial music of every side-burned delinquent on the face of the earth.”
That was expressed a little over-the-top, but it probably represented a consensus of what adults thought at the time.
Fastforward to 2010. The default assumption today is that every adult (under the age of about 70) likes, loves, or is obsessed by some version of the giant octopus of musical arms that rock and roll grew into. (Country music counts for the purpose of this definition.) You would be very surprised to find someone who thought that no aspect of popular music wasn’t great, no matter what they thought of rap or metal or Britney Spears or fill in the blank.
Culture counts. You can’t take culture out of music because music is intrinsically culture. If you asked your question about rock music in the 1950s, even the most broad-minded would have agreed that classical music fans were truly more intelligent. In today’s world, every intelligent and super-intelligent person brought up in the rock era loves some form of rock.
Is it still possible that the small, self-selected group of people who love classical music are smarter on average? Of course it’s possible. For one thing, they are about 1% the size of the other group. And to be exposed to classical music in equivalence to rock music takes more time, effort, money, and association with people who have those things, which are also highly correlated with education. The average intelligence of a educated, selected 1% of the population will obviously be higher than the average intelligence of 99% of the population.
Is there any evidence that the 1% are more intelligent than the top 1% of rock lovers? None whatsoever. Are there studies that control for education and culture that show this? I don’t know of any and this one doesn’t. It’s worthless as other than a factoid. Can you take people outside their cultures and experiment on them for a lifetime to test this? Not likely. A teenager who has never been exposed to classical music is a wholly different kind of person than one who has listened to rock for all those years. You can’t suddenly introduce one and have it equal to the other.
People have been approving and denigrating types of art for the history of humanity. And what gets approved varies for the history of humanity. The only thing that proves is people like to define the world to include themselves and exclude Others. That may be human but it’s not intelligent.