I think the nail has been hit on the head in the last few posts, namely that many music appreciation teachers in schools often select the wrong material to present to children or older students starting out on classical music education.
I remember my first encounter at school when the music teacher put on a piece of Mozart, details of which I now forget. He himself went into a semi-trance, waving his arm around in conductor fashion, oblivious to the fact that the class was bored stiff and couldn't wait for it to end. And so it went on for a year. At the end of it, I felt even more disillusioned with classical music than at the beginning, as did most others.
A better method might have been to play a quick selection of pieces across the era/genre divide, and ask the students to vote on what they liked and disliked (scores 1 to 10), in order to keep them interested and focused. Then ask the group to discuss it among themselves and come back with the best unified view they could reach on a ranking. The next step would be to home in on whatever type it was that they enjoyed most. For example, if the most popular was, say, solo piano the next step would be to arrange another vote on a more focused set of pieces among the main composers of such work, in order to show the different styles. Then organise a further sub-vote.
It's basically a question of finding a good starting point on the ladder, as selected by the students themselves. If the group know it's their collective choice that's being investigated, they might "own" it more instead of feeling alienated from it.
After this, a start could be made on the second rung, etc. After a few months of this, I reckon it would produce more budding enthusiasts than the more traditional methods, of the type that I experienced.
Just a thought.
Topaz