I think this is one of those songs that has many meanings and he probably knows that. I think he also mentioned somewhere that he hadn't written much prior to beginning to write for this CD. It could be that he was wondering if he could still write or had the desire to. Sounds silly, but every artist wonders that before they start the next song, painting, weaving whatever "Can I still do this?" You live in fear of waking up one day unable to do what you love most.
Or it could be about a lack of harmony in a relationship too.
I think it has a whole lot of meanings and Mr. Lightfoot will never tell us what it meant to him.
