Being somewhat new to the folk music scene but spending 45 years playing jazz trumpet, I can say that although it doesn't seem to fit perfectly with James Taylor, there is not a wrong note he played in my opinion. Jazz guys, especially sax men, seem to find some modal line that is loosely related to the chord structure and if you can follow it, there is a thread of logic to it. Don't get me wrong, I don't care for this rather off-the-wall line he chose, but I think it is based on sound music principles. Just my opinion.   jimmyt