Sohn Minsoo finds a world of Bach in his teacher’s marked score

About a year after pianist and educator Russell Sherman died, his widow and fellow pianist Byun Wha Kyung handed one of their students Sohn Minsoo a score Sherman had studied for years: Bach's "The Well-Tempered Clavier." "Take it home and have a look," she said, according to Sohn, 50, who is now on the faculty of the New England Conservatory, where Sherman and Byun taught for decades. The score was dense with Sherman's markings. There were "so many moments that moved me deeply" as he worked thr