Naïve and Sentimental Music is a symphonic work by the American composer John Adams, the title of the work alludes to an essay by which German poet, philosopher, physician, historian, and playwright?
Naïve and Sentimental Music:  The title of the work alludes to an essay by Friedrich Schiller, "On Naïve and Sentimental Poetry", that contrasts a creative personality that creates art for its own sake (the "naïve") versus one conscious of other purposes, such as art’s place in history (the "sentimental"). Friedrich Schiller: Johann Christoph Friedrich von Schiller (] ; 10 November 17599 May 1805) was a German poet, philosopher, physician, historian, and playwright.
Friedrich Schiller