Abstract: A musical instrument or multimedia input device is disclosed. User input is by hitting or striking water in order to produce an at least partially transient acoustic disturbance, vibrations, or change in the water. In one embodiment rigid pipes of various lengths or diameters emit fluid for being struck by a user at an open end of each pipe. The other end of each pipe is connected to an elastic tubing or other elastic medium, such as a diaphragm or bulb, resulting in a hydraulic resonator. In another embodiment the resonators are formed from variously sized bottles or flasks encased in cement, except for the mouths of the bottles. Each hydraulic resonator may be fitted with a sensor that senses the vibrations in the water and amplifies the vibrations into a sound reproduction system, such as an entirely acoustic impedance matcher or an electrical amplification system.