What is particularly unique about Beethoven's Moonlight sonata?
A. It is the first piece Beethoven wrote that was in a minor key.
B. He quotes several pieces by Haydn and musically "rejects" their thematic material.
C. It breaks free from traditional Classical formal plans by beginning with a slow movement.
D. Beethoven was the first person to write music for the new instrument known as the fortepiano.