The Great Stalacpipe Organ, claimed by its owners to be the world's largest musical instrument, is a keyboard instrument that works by tapping stalactites of varying sizes with rubber-tipped mallets attached to solenoids in order to produce tones.
The Great Stalacpipe Organ, claimed by its owners as "the world's largest musical instrument," is likely the largest and oldest naturally formed lithophone. It is harnessed by a custom pipe organ keyboard console that actuates tapping of ancient stalactites of varying sizes with solenoid-actuated rubber mallets in order to produce tones.