This post won't be anywhere near as fancy as anyone else's!

Firstly, while there obviously is a distinct corrolation between smartness and a love of classical music, I know plenty of people who are pretty normal teenagers, with average intelligence, that appreciate classical music.

I have one friend who is hardworking and friendly, but she's also pretty streetwise and not particularly intelligent to be blunt. Nevertheless, she's a great fan of classical music (as well as many other forms of music). To quote her words,
"I wish people would just give classical music a chance."

When I listen to Classical Music I don't stop to think,
"Oh what a clever way the composer used the warm cellos to compliment the rich tone of that mezzo-soprano's voice." I think that if a piece of music is great then you shouldn't have to stop and think about what the music is doing, your emotions should be able tell you that.
When I listen to Classical Music I just let it wash over me, I relax and I unwind. One of the greatest assets of Classical Music is that you can enjoy it without having to think.