The Wave Organ was constructed as an acoustic sculpture in the 1980s on a jetty built from grave markers that were scraped from the last cemetery in San Francisco that resisted moving to Colma. A picture of the Laurel Hill Cemetery can be seen in the middle of this page, which recounts the history of cemeteries in San Francisco, including this directly relating to the materials used in not just the Wave Organ but the jetty itself:
Once the entire removal process had been completed, the tombstones were broken into pieces and used as paving materials for gutters lining the walks of Buena Vista Park. Other tombstone fragments were used to create the breakwater near the St. Francis Yacht Club and contractor Charles L. Harney was paid 80 cents per ton to dump crypts and heavy markers into the Bay. Sadly, few of the elaborate Egyptian, Gothic and Neoclassical monuments survived.I went here on January 2, during the day, and definitely not during a full moon. I cannot attest to the sound quality of the art installation, but I have more photos to follow. I've got to break this cycle of not posting things!