The Greatest 20th Century Classical Composers

List Rules
They have to have been born past 1870 and produced most of their works in the 1900s
When you think of Classical music what comes to mind? A bunch of people from hundreds of years ago, but what people don't realize is that Classical music is alive and thriving, in a far different form then even during the Romantic era but its still alive and it greatly thrived during the last century with Avant Garde and the influence of Jazz and Rock. Here are in my opinion the greatest of the age.