I haven't searched for it yet, but I read an article about a year ago, I think at BBCAmerica Online, about why people like the music they like. The conclusion was that most people in their older years prefer the music they were exposed to as a child, which seems kind of obvious, but the thing that stuck with me about it was the suggestion that your musical taste doesn't change as much as you might think - the music you listen to in your late teens and twenties and thirties doesn't have the same impact in your brain as the music you heard as a kid. Makes the argument for exposing your kids to a large variety of musical idioms at a young age. If you'd like, I'll try to find the article.