Water organs are musical instruments that produce sound using water as a medium. They typically consist of a series of tubes or pipes filled with water, where the pitch is determined by the water level in each pipe. When air is blown into the pipes, it creates vibrations that result in musical notes. These instruments have a long history, with examples found in ancient cultures. One famous type is the hydraulis, an early water organ developed in ancient Greece. Water organs are often used in public performances and can create unique, soothing sounds that are distinct from traditional wind instruments.