The tune is beautiful, as we’ve established by the number of people who have used in in their songs.
But the song is so sad! The cowboy’s great love is leaving the valley. And she loves him, obviously, because she came and sat by his side and listened to him sing to her all about how much he will miss her.
Why couldn’t they make it work?
And now it’s stuck in my head.
And worse is the worry that it’s her leaving that causes him to become depressed and look around for barns to sleep in and, eventually, for other women to comfort him because he never understands why the one he loves left him.