Spreckels Organ Society in downtown San Diego's Balboa Park is a nonprofit founded in 1988 to preserve and program the Spreckels Organ—the world's largest outdoor pipe organ—from the Harrison Albright-designed Pavilion at 1549 El Prado. The instrument contains 5,017 pipes across 80 ranks, built by the Austin Organ Company in 1914 and subsequently expanded by Lyle Blackinton and Associates, producing sound through wind pressure alone with zero electronic amplification—a purely acoustic engineering achievement on the same Balboa Park performing arts corridor that includes The Old Globe. Civic Organist Raul Prieto Ramirez—the eighth person in history to hold the position—performs weekly concerts every Sunday at the Pavilion, with the Society also producing a Monday evening Summer International Organ Festival featuring visiting artists and a silent-film night. The organ was a gift to the people of San Diego from brothers John and Adolph Spreckels for the 1915 Panama-California Exposition, and the Society's preservation work includes coordinating with the City's Parks and Recreation Department and concert collaborations with performers from venues like Jacobs Music Center downtown. The Society's most technically demanding project was the citizen-funded Drive to 5,000 expansion campaign, which added pipes and ranks to reclaim the organ's title as the world's largest outdoor instrument after a challenge from the Heroes' Organ of Kufstein, Austria.