Apologies for the delayed response, we had a (very welcome) surprise visit! 
Cignolimama - Sorry, I should have been clearer: I was talking specifically about folk culture (i.e. "live and unsigned" music, dance, art, poetry etc) being inaccessible, not mass culture. I deleted a bit of my post for the sake of brevity, which basically argued that we need these subjects in school to encourage people to become active interpreters of and contributers to culture, rather than merely passive consumers (as the "culture industry" encourages us to be). I think that this is a problem in most affluent countries, because the culture industry grows as disposable income increases. (I know I'm drawing very heavily on the Frankfurt School here, but I think it's still relevant.)
As far as the "gulf" at university goes... I don't think it was just "superficial gloss", although they certainly had that. The students from private or selective schools definitely had more presence: they were generally able to "cut through" if more than one person started to speak at the same time, could get away with speaking more slowly without being interrupted, seemed more mature and worldly, and had perfected the kinds of non-verbal communication that Obama uses so effectively. They also approached every meeting as a networking opportunity rather than a discussion/meeting between acquaintances, and made a point of inviting us all to their am-dram shows and comedy nights in between meetings even though they were obviously planning to spend the evening with other attendees who they knew better (most were studying Law or Medicine, so had their own course-specific am-dram societies). Naturally, they also made better first impressions: more eye contact, more confident handshakes, speaking with chest rather than head voices, etc, and they seemed to assume that everybody was interested in them and what they had to say. And, of course, they all made damn sure they were sat as close as possible to the most important people at the table
. I did learn a lot about how to perform from watching them, but I think the inner confidence and self-assuredness they had was probably as important (or even more important) than the outer illusion, and unfortunately that's something I can't "adopt" at present (although I'm working on it).
Thinking back, my experience of that programme made me feel pretty much the same as my first out of two interviews for English at Oxford. I got 2/10 for that one, even though it focused exclusively on modern English novels, which later became my specialism at university (and which I was clearly excellent at, because my marks were outstanding all of the way through). In contrast, I felt perfectly comfortable with the (very intimidating) Medieval English interviewer, who gave me 8/10 even though I admitted that I knew nothing about his subject at that point and was presently most interested in Terry Pratchett, Kazuo Ishiguro, and other contemporary authors...
I'm not suggesting that the first set of interviewers marked me down because my face didn't fit, which is what I felt at the time - in retrospect, I think that my lack of "gloss" and self assurance meant that I didn't perform at my best, and they didn't have the skill to see past that or put me at my ease as the second interviewer did.