I love the song 'El Rey.' And for years I never knew what the song was totally about. It was something new for me. I'd never sung a song in Spanish before. Then I got the translation and saw what a really cool song it was.
I think that concrete poetry seems to have as far as I can see come to a kind of a dead end. It doesn't seem to be going any further than it went in its high period of about five or six years ago.