匹兹堡青年交响乐团排练莫扎特第三小提琴协奏曲， 独奏为匹兹堡交响乐团首席
Pittsburgh Youth Symphony Orchestra (PYSO) rehearsing Mozart Violin Concerto No. 3 at Heinz Hall in December 2012 with soloist Noah Bendix-Baigley, the Concertmaster of Pittsburgh Symphony Orchestra. William plays cello.
