I've never wanted to learn music theory. I just want to play. I would write songs on my guitar when I was in college. A friend who was a guitar theoretician st

I've never wanted to learn music theory. I just want to play. I would write songs on my guitar when I was in college. A friend who was a guitar theoretician stopped by and listened. He said something like, "Odd, you went with a G7 instead of an Am. In that triad you should have played the Am." (Or, you know, some kind of foreign language like that.) I mean, it sounded fine my way. Although for a moment I questioned why thew G7 and tried an Am… briefly. I was afraid suddenly though that if I learned music theory I would have to start writing songs the right way.