J.S Bach: Unfinished Fugue (Contrapunctus XIV) 

Bach's final piece, it is unfinished because he died, but what a beautiful piece he left us all with, even though unfinished, the sudden abruptness of the ending brought meaning to it all - that Bach would rather meet his end upon a unfinished work than a complete masterpiece. He wanted to have the rest of the piece written for him, by us, to make sense of it all, for ourselves - the living.