If they've ever liked it, they'll probably still be pre-disposed toliking it later on. I was forced to listen to TOm freaking Jones as a kid cause my dad liked them. I find myself liking the songs that keep showing up in commercials and stuff now because of that exposure then even though my tastes have always been a lot heavier. But that's just one experience so who knows?!! My son likes the Dukes of Hazzard theme song since we found an old 45 record in the basement and I played it for the hell of it. He says "good old boy" and starts dancing around to it.
It's Hilarious.