Musicians have a certain power to insinuate themselves into your life. You could meet a guitarist, say, who happens to know a song that you love. And then he plays it for you, and you're hooked. That song has taken on new meaning for you. That song is now firmly attached to whatever it is he meant when he played it for you. Was he looking you in the eyes? How did that make you feel? You remember that every time you hear that song. Musicians have a power, when we mean to.
Sometimes you play a song, and you really see it when you're singing and you really mean it when you're playing. And sometimes you're just going through the motions. You can tell when a musician means it, because that's when you're paying attention. When they don't mean it, that's when you're sipping your drink, looking for somebody interesting to talk to.
When you write a song for somebody, you have that same power as the cover song, but with greater potential. That power to do harm or good. But you only have that power if the subject knows that the song is about them. It's amazing how a song that you thought was so personal as to be non-applicable to any new situation can be taken out of context.
I guess there should be a point to all of this. Nope. No point. Just an observation. Point withheld.