This commenter hit the nail on the head:
Have you noticed that those responsible for background music in film seem to know what “Catholic music” is? If the scene takes place in a Catholic church the instrument you hear is almost always the organ. If someone is praying in front of a statue, the music you hear is chant. Unless the movie’s a comedy, a producer wouldn’t dream of accompanying a scene inside a Catholic Church with an electric keyboard or a guitar! Even after forty years of “new age” replacements for that which has for centuries been our musical heritage, producers represent our “Catholic” music appropriately. Does the confusion only lie in our local parish churches?
Also check out the ex-Lutheran homesick for a singing congregation.