The orchestra mounted two large video screens in its hall for a performance. “The concert was the first in the ‘Classics Unmasked’ series that marks a departure from the DSO’s traditional format. The new style aims to attract a generation weaned on television and stimulated by music videos and the Internet. For the first time, audience members in the farthest seats could see the angle of a violin bow as it hit a string or even the veins of a musician’s hands.”