"are you comparing great poetry to the musical example under discussion, simply because it doesn't follow the "normal" musical rules"

Not really. I'm talking about intuitive creativity. I'm not drawing a comparison, I'm making an analogy of the creative processes outside the technical skills.

"Great poetry -- or great art of any type -- requires a honing of skills and a close attention to how those skills are being used"

I suppose it depends what your idea of "great" is. Not, I hasten to add, a word that I used.I'm not sure how much deliberate honing of skills there is in, say, the poetry of Clare or Robert Bloomfield's 'The Farmer's Boy'- and in Edward Thomas's poetry there is a deliberate 'unhoning' that was criticised by his friend Walter de la Mare.