This is the famous Pathetique Sonata in C Minor by Beethoven, first movement. The drama in this movement comes from the extreme and sudden contrasts in tempo and mood.
The fugue from J.S. Bach's Prelude and Fugue in C Minor, Well-Tempered Clavier Book 1. This piece is a favorite of music theorists because it is structured very traditionally.
My name is Mike Alfera and I'm a music composition major at University of Southern California. I set this page up so that friends and others can download my piano performances. Enjoy!