"saddest" or most "tragic" clical piece in your opinion?

In your opinion what do you think is the saddest or most tragic clical piece of music, or even a couple titles ? To me it would be Samuel Barber's Adagio for Strings or Symphony no. 7 in A major by Beethoven. I'd really like to hear what other people think! Also, I really like Dvorak and wonder if anyone knows of any other "modern" clical composers with the sort of "new world symphony" feel.. I love godspeed you black emperor :) So let's hear it!