American pianist Jonathan Biss has just completed a 9-year journey exploring the piano sonatas of Ludwig Van Beethoven. In his conversation, Mr. Biss shares how each sonata revealed a different side of the composer's character, which was definitely much more than the scowling face we often see on CD covers and books. The journey was also one of discovery for the pianist himself: Mr. Biss certainly doesn't feel like he's in the same place as when he started nearly a decade ago.