And the problem with reaching consensus is that different people will look at various elements from different angles, glean different meanings, make different assumptions, etc., etc., etc.
I perform music that is hundreds of years old. There is not much consensus on the way a piece should be played or sung. There's not even consensus on what the composer's intent was in a given work.
That is something you and I most definately have in common, Milo! I also perform music that is hundreds of years old. Violin, cello and piano. My favorite is baroque. But anything from between 1550 - 1850 is perfectly fine with me!
I think the composer's intent is whatever the listener feels in his heart. That is a personal viewpoint of mine though, although I've held that viewpoint ever since I was a kid. No two people ever interpret music in the exact same way. It speaks to the soul. I think the great composers knew this.
This is also probably true of today's music, including that Willie Nelson song. Personally I am appalled by it. Others will not be. That doesn't make their interpretation wrong though....