Hydraulic Organ
A hydraulic organ is a type of musical instrument that produces sound using water pressure. It operates by forcing water through pipes, which creates vibrations that generate musical notes. The design of hydraulic organs dates back to ancient times, with notable examples found in ancient Greece and Rome.
These instruments are often large and complex, featuring multiple pipes of varying lengths to produce different pitches. The hydraulis, an early form of the hydraulic organ, is considered one of the first keyboard instruments and laid the groundwork for later developments in organ music.