Beethoven took the sonata form from Mozart and Haydn and developed it in a revolutionary way, turning his sonatas into epic tales. The Pathétiqe sonata Op. 13 is a hallmark in the repertoire (Pathétiqe referring to "emotional" rather than the "pathetic"), and in this video Henrik Kilhamn goes through the first movement section by section and explains how they fit in the larger scheme of things.
Introduction and analysis (2:04)