By Maia Bronfman '24 It is important, if you are improvisationally accompanying a silent film on an organ, to not detract from the theme on screen. Peter Krasinski, a renowned secular and sacred organist, taught this and other lessons on Thursday night at Memorial Chapel during a masterclass with students of Alcee Chris, assistant professor of music.  Chriss had his students each choose silent films to accompany during the masterclass. The silent films organists accompany are rarities in themselves, with 75 percent of the genre having been lost, according to the Library of Congress. Chriss, also an organist but inclined…