It's odd how it happens. I write what I think is a poem - even post it to this blog. Then I'm messing around on my guitar, not really focused on anything, when a chord sequence and a melody spring out of nowhere. In this case even a new tuning I've never used before (CGCECE for you guitar players). Immediately the words I wrote a week or so ago leap into my head and fit this melody perfectly - well, with a few changes suggested by the music and the less formal meter of a lyric.