Not everything. For example, how did Wagner create his music? The ability to appreciate beauty stands above reasoning. But your point largely stands, as langugage processing alone allows to build a "linear thinking machine" with super human reasoning ability. It won't be able to make music or art, but it will create a spaceship and take science to the next level. As a side effect, such AI will erase all art, as art will look like noise in its "mind".
