Hmm, I wasn't able to follow your blank canvass scenario, it seems that it would better exemplify views having to do with a different matter. Relating music to something so functional as language is problematic, I mean, if you have something very specific you know you want to say, why not just say it? Write a book, blog, open-letter, etc. There is a difference between knowing what you want to say and knowing that you have something to say (while what this is exactly remains elusive, even to yourself). Art is the result of the latter.