There's nothing wrong with classic rock - it was a great era. But if somebody my age lists that as their only musical preference, it tells me he's one of those guys who hasn't listened to any new music since he got out of college. It's a weird phenomenon, but many people's musical tastes/interests seem to ossify at that age. I've never understood it - there's been so much good music made in the world since that time, how could you limit yourself to just the music of your youth? But it's such a common phenomenon that I figure there must be something biological in the brain that happens to those people.