My son is a John Williams fan. Just like his father. My then 2 years old son greatly responded to classical music which my family discovered. It wasn't long before he was humming The Imperial March. Today at 4+ he is already able to differentiate between, Star Wars, Superman and Imperial March. Vaders Imperial March is his favorite. We play it every week on the way to school.
I've given up trying to get my girlfriend to like any of this stuff. If I'm listening to music in her presence then I would choose something soft and nice like Barry or Delerue but she would never choose to listen to it herself. I don't see the point of trying to make her like something she doesn't.
By the same token, she doesn't try to force me to like Leona Lewis (or whatever tripe she's listening to at the moment)
James Horner didn't have a problem with Leona Lewis...