Ive been listening alot, to the point of obsession, to Rachmaninoff's Piano Concerto No 2. It is a monumental, colossal, magnificent work, from the hands of God. The themes are so melancholic and so deep, and the development is stunning as well. I even tried to download the score to try to play it, but of course i am playing at like 1/8 of the speed, at the very most.

Do give it a listen