Hydrocordion is an instrument featuring water as a main element in the generation of sound made by David Gauthier, Di Mainstone, Richard Shed and Louis McCallum. Hydrocordion was displayed at the Science Gallery in Dublin part of the Surface Tension exhibition.

As Di explains in the video, the instrument is quite simple:

(1) squeezable pumps fills up cylindric pipes with water, dynamically raising or lowering the volume of fluid in them.

(2) foot activated pressure valves introduce air (wind) into the top of the pipes where a 3D printed flute-style nozzles are located which in turn generate tones. Higher the fluid in the pipes, higher the pitch of the sound. Using a microphone, these sounds are sampled and filtered through a DSP unit which tint the notes and give them a specific character (one for each pipes).