Mike Perlowin wrote:...To really learn music theory, it's nec4ssary to learn to read its written symbols...
Well, yes and no. If your talking about the formal study of music theory, yes absolutely. But to understand the fundamental concepts of music theory as they apply to mainstream music and musical instruments (perhaps to folks like Don B) I don't think so. Particularly if it dissuades someone from learning those fundamental concepts simply because they believe that reading notation is a prerequisite to understanding them. As many have mentioned, there are plenty of really great musicians who never learned formal music theory, who can't explain what a chord substitution or a tritone is (even if they use them all the time), but they understand how music works, how things fit together.
I took four semesters of music theory in college. Endless amounts of scoring and notating, sight singing, etc. Like most of the stuff we all learned in college, it is mostly useless to me now. It certainly gave me a deeper insight into how everything fits together, but this is not the stuff that makes musical "theory" comprehensible to the average Joe.
For most folks, just a basic understanding of the intervals and relationships in the seven tones in your ordinary brown bag major scale will open way more musical doors than did all the additional stuff from my theory classes (stuff I've had little use for since). I can read and write musical notation but I rarely do, and I don't feel that skill is relevant to my actual
understanding of music. While it might make me more technically proficient, it doesn't make me a better musician. And for those of us who choose to dig deeper, the rest is all still there to learn.