As I've posted here before, Mason is very into classic music right now. He got interested in it kind of by accident. He also went through a TV phase (sadly, he seems completely out of that one -- and, okay, it's only sad because we can't easily distract him by suggesting he watch TV anymore.)
Anyway, during his TV phase, I introduced him to Fantasia (the original) which we had a VCR tape of. He's been fascinated ever since. My "teaching" style as a parent tends to be very opportunistic. Mason is into music right now, so I find music related things for us to do. MomCulture had a day at the opera program that we went to, and Mason loved that. They had jazz duo performance at the McPhail center, and we went to that. I signed us up to be on the mailing list and got a notice in the mail earlier this week about the Bakken Trio (a violinist, cellist and pianist) who will be doing an informal show at the McPhail today over lunch. We're going. It's Mason's first "grown up" concert.