Following in the footsteps of other American orchestras which have recently begun to embrace new technologies, the Boston Symphony is launching a free series of video podcasts as part of its two-year focus on the music of Beethoven and Schönberg. “The videos, which range in length from one to five minutes, discuss important works by the two composers, illustrated with still photographs, paintings, images of scores, video, and musical examples. They originated on the orchestra’s ambitious web site as part of its three-year-old Online Conservatory project, but are now available through Apple’s iTunes music store.”