Most music isn't art. It was never intented to be and it isn't by most definiitons of art.
Some classical music is pure entertainment also. Not all classical music is art. Entertainment music can still be of high quality. But often this is wasted talent and effort because it does not try to be music. It tries to be entertaining.
You don't try to convince friends and familiy. Actually, even if one were stupid enough to do so it would have no use because the people need to hear the music before there is anything to talk about. Now I strongly oppose the stupid 'talking/reading/writing about music is like dancing about architecture'-argument but you cannot describe music to someone. One needs to hear it and then you can talk. You aren't going to convince anyone through words about the power of some kind of music, ever.
People need to come to you. If you are knowledgable about music and people want to know something they will come. If they don't come, don't waste your words. Really, trying to convince someone some style of music is worth listening often falls on dead ears. People are stubborn, conservative and close-minded.
If someone is going to talk about the music of Britney Spears then one does not talk about Britney Spears. If one does talk about Britney Spears one can not talk about music.
is something superior because only a select few are able to appreciate it?
Any other argument that one would make to claim classical music is superior to some other forms of music will generally be stronger than this one. I am not sure why you used this one since it is not consistent with the other things you wrote. One would predict the writer would continue with a strong argument and then try to refute that one, not with one that is obviously non-sense.
Tash made the argument from the cultural point of view. American Pie has no cultural value (yet..., and one would hope it will never be, but it is not impossible either. Our culture may degrade that in the future American Pie is one of the prime examples of where it went 'wrong'. Now I should add that I have never seen the movie so I don't know what I am talking about exactly.). If one teaches about music it is easy to see that the cultural significance is a very small one. The same goes for literature. Both music and literature require skill, craftmanship. Maybe being a ciniast will one day also require craftmanship but at it stands now it is quite primitive and crude.
The point being that the fact that American Pie is culturally insignificant and therefore not worth the time in english class has nothing to do with the quality of the craftmanship, which this discussion is about. At least I think it is. Crap can be, and sometimes is, culturally significant and it does get it's time in language, culture or literature class.
Music is music. Yes, but this is only relevant to a musician, or rather a true musician. Music may be utter crap but one can always learn something from it or see some little element that shows promice or one bit that could have grown into something aestetically pleasing, etc. But this requires a 'carpenter's eye' and it doesn't really have anything to do with enjoyment, art and all that.
Most people refuse to understand it, hmm yes. But do you make any effort to understand Homer? Shakespeare? Or maybe even Joyce? What about other arts? Picasso or some other craft of art. Have we musicians put any effort into that? Hmm, I haven't eventhough I have some of the books of the writers I named in my bookshelf. Eventhough I do have the intelligence and time to do it I haven't done it (yet). Of course the fact that I spend a lot of time on music means that I have less time for other arts.
Sure, music may be the superior art, according to most, but that doesn't mean people can't make other choices. Am I a lesser person when I don't understand literature? It does require a lot and a lot of effort and time.
Those people that are able to spend their time in understanding art are a large minority, even in the rich western world.
Someone once said that chess is a great game, but an utter waste of intelligence. I think this is incorrectly credited to Einstein, who was an ok chess player because he was once a roommate of Lasker. This is true in some sense. All art is utter waste of time and talent. Shouldn't we focus on something more important instead? What about history? If you focus your resources on history you will get an utter different perspective on the world. You will understand how many things have happened, that were once very important and which only a few people care about today. And about how many times history repeats itself. This is all very enlightening.
What about the sciences? If you spend your time on those you can really learn something. Sure, in a sense music is both a mix of science and the utterly bizarre notion of human sociology, the most bizarre field of thought and research ever, combined with a special kind of love and passion, but from the point of view of science that is a pretty poor combination.
Then you have the functional crafts. They can require just as much skill and craftmanship but when you can build a sturdy chair that lasts you can do something 'useful' instead of sculpting a 'silly' statue out of wood.
But when you add to human society then this can be called futile as well. The only think human society does it foster humans, which are utterly worthless creatures. So maybe the best thing to do is 'waste' your crafmanship on something no human cares about. Something done for the sake of nu human. In that case the resulting work of art transcends human pointlessness.
Let's face it. The only worthwhile thing mankind has done, apart for caring for itself, both in the worst and most virtuous ways, which has obviously no value to anyone that is not a human, is producing a collection of wonderful chess games, magnificent statues, stunning paintings and great pieces of music.