Once upon a time, kids had Bugs Bunny cartoons every Saturday morning for that...
As I got older, I'd hear certain pieces somewhere, that I'd recognize, but didn't know from where. I'd start paying attention to more and more classical stuff, and then I'd see a cartoon that I was very familiar with, and there would be a piece. I started figuring out that a lot of the pieces that I liked, I had first heard in cartoons.