If our eyes only saw frames (IE: 30 images a second), like a single lens reflex camera, we'd see images pop in and out of existance and that would really be annoying and not as advantagous to us in our three dimensional space and bodies.
In the Vienna of the second half of the 18th century, in addition to Haydn and Mozart, three symphonic composers, namely Leopold Hoffmann, Carl Ditters von Dittersdorf and J.B. Vanhal helped further the development of the symphony.
Today, it stands as one of the most played symphonies in the world. In 2001, Beethoven's autograph score of the Ninth Symphony, held by the Berlin State Library, was added to the United Nations Memory of the World Programme Heritage list, becoming the first musical score so honored.