CounterpointAs his mother was dying, Philip Kennicott began to listen to the music of Bach obsessively. It was the only music that didn't seem trivial or irrelevant, and it enabled him to both experience her death and remove himself from it. For him, Bach's music held the elements of both joy and despair, life and its inevitable end. He spent the next five years trying to learn one of the composer's greatest keyboard masterpieces, the Goldberg Variations. In