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.
Beethoven was almost completely deaf when he composed his ninth symphony. The Symphony No. 9 in D minor, Op. 125 (also known as the Choral), is Ludwig van Beethoven 's final complete symphony. Completed in 1824, the symphony is one of the best-known works in classical music.