Pulling Out All the Stops to Save a 40-Ton, 100-Year-Old World's Fair Pipe Organ

DEEP beneath San Francisco’s Civic Center Plaza, in a windowless bunker called Brooks Hall, a 40-ton pipe organ gathers dust. Known variously as the Exposition Organ and Opus 500, the century-old instrument was a mechanical and musical wonder when it was unveiled in 1915, the seventh-largest organ in the world.