What is a waterphone?
The waterphone is one of the most mysterious and recognisable instruments in the world, even though almost nobody knows its name: it is the source of the horror sound you have heard a thousand times in film. That metallic, ghostly, sliding shriek that appears just before something terrible happens in a horror movie almost always comes from a waterphone.
Physically it is a stainless-steel resonating bowl from which a central tube protrudes — this is how it is partly filled with water. Around the rim, bronze rods of different lengths stick out, tuned at irregular intervals. It is played by bowing the rods (just like a violin) or striking them; the water inside, as it shifts, causes the pitch to curve, slide and vibrate unpredictably. The result is that ethereal, unsettling, otherworldly sound that defines the horror genre.
How it works: the secret is the water
The waterphone combines metallic resonance with water modulation. When you bow a rod, it vibrates and transmits that vibration to the bowl, which acts as a resonating chamber and amplifies the sound. Up to this point it would produce a fairly stable metallic tone.
The magic comes from the water inside. As you tilt or rotate the instrument, the water shifts and alters the vibrating mass, causing the frequency to rise and fall continuously — creating glissandos (pitch slides) that are impossible to produce on any conventional instrument. The rods are also tuned at microtonal intervals — outside the Western scale — generating harmonic clashes and beating patterns that the ear perceives as tension. This combination of unstable pitch, microtones and metallic overtones is precisely what our brain associates with “danger”, which is why it works so effectively in horror cinema.
The instrument of terror: where you have heard it
Once you know what a waterphone sounds like, you hear it everywhere. Its timbre appears in horror, suspense and science-fiction soundtracks for decades: film trailers, tension scenes, video game and series sound design. It is one of the most recorded instruments in cinema history precisely because it creates atmosphere with a single bow stroke, without composition or melody.
Composers and sound designers love it because it produces an effect that no synthesiser fully replicates: the water introduces an organic randomness that sounds alive. That is why, even though VST sound libraries exist, many professionals still record the real instrument for those scenes where the sound has to make your skin crawl.
How to play the waterphone step by step
The great surprise of the waterphone is that anyone can produce a spectacular sound in seconds. There are no notes to learn, no sheet music: it is pure sonic exploration. Follow these steps:
- Add a little water. Pour water through the central tube until it covers roughly one third to one half of the bowl. More water = more pitch slide; less water = drier sound.
- Hold the instrument by the tube. Grip the central handle with one hand so you can tilt and rotate freely.
- Bow one of the rods. Draw the bow across the edge of a bronze rod, just as you would play a violin. A sustained metallic tone will emerge.
- Tilt and rotate while bowing. This is where the magic happens: moving the water makes the pitch curve and slide. Experiment with the speed of tilting to control the glissando.
- Combine techniques. Tap the rods gently with mallets for percussive sounds, bow several at once to create layers, or use a soft mallet for deeper, lower tones.
The typical beginner mistake is using too much water: the bowl should not be full, as the sound becomes choked. Start with a little and add more until the pitch slides nicely without losing volume.
Video: how the waterphone sounds and how to play it
This video shows how bowing the rods and moving the water produces the characteristic pitch slides so associated with horror cinema.
Types and sizes of waterphone
Not all waterphones are alike: they vary in size, number of rods and tonal range. This table summarises the main options:
| Type | Characteristics | Approx. price | Best for |
|---|---|---|---|
| Mini / starter | Small bowl, few rods, higher pitch | €100 - 200 | Trying the instrument, quirky gift |
| Standard / mid-size | Medium bowl, good balance of rods and range | €200 - 400 | Musicians, home sound design |
| Concert / large | Large bowl, many rods, deep low tones | €400 - 700 | Professional studio, film, live performance |
| VST library (software) | Recorded waterphone sound, no physical instrument | €0 - 100 | Computer production, film scores |
If you only need the sound effect for a project, a VST library makes financial sense. If you want to play it for real and enjoy the physical experience, a mid-size model is the sweet spot between price and capability.
Waterphone vs other rare instruments
The waterphone belongs to the family of curious instruments that sound “otherworldly”. Here is how it compares with its closest relatives:
| Waterphone | Theremin | Handpan | |
|---|---|---|---|
| How played | Bow on rods + tilting water | Contactless, hands in the air | Striking zones with hands |
| Sound character | Terrifying, sliding, metallic | Ethereal, sci-fi | Relaxing, meditative |
| Basic difficulty | Very easy (atmospheres) | Difficult (no fixed pitch) | Easy to moderate |
| Price | €100 - 700 | €100 - 400 | €200 - 2000 |
If that eerie, “note-free” sound fascinates you, also compare it with the theremin; if instead you are after something melodic and relaxing in metal, the handpan is the way to go.
Uses of the waterphone beyond horror
Although its fame comes from horror cinema, the waterphone is far more versatile than it appears:
- Soundtracks and sound design — tension, suspense, sci-fi atmospheres and video-game scoring.
- Experimental and ambient music — ethereal textures and soundscapes for meditation or art installations.
- Sound therapy and relaxation — its sustained overtones are used in sound-bath sessions alongside Tibetan singing bowls.
- Organic percussion — struck with soft mallets it adds unique metallic accents to any recording.
Interestingly, the instrument’s inventor Richard Waters reportedly discovered that whales responded to waterphone sounds played underwater, leading to experimental recordings of cetacean communication. Legend or not, it illustrates just how alien this instrument’s sonic palette is.
Care and maintenance
The waterphone is robust, but water demands some care to keep it sounding great for decades. After each session, always empty the water through the central tube and leave the instrument upside-down to dry: standing water can oxidise the interior and create odour. Clean the bronze rods with a dry cloth to remove dust and bow rosin; if they lose their shine, a gentle metal polish restores them. Apply a little rosin (colophony) to the bow periodically so it grips the rods cleanly and produces a clear tone. Store it somewhere dry, away from knocks that could bend the rods out of tune. With these simple habits, a quality waterphone lasts a lifetime.
Where to buy a waterphone
To start out, a mini or standard model will give you all the horror sound without overspending. For studio work, step up to a mid-size or large model:
Frequently asked questions
What exactly is a waterphone?
An acoustic percussion and friction instrument invented in the late 1960s by Richard Waters. It has a metallic resonating bowl partly filled with water, with bronze rods of varying lengths around the rim. You bow or strike the rods, and the water causes the pitch to bend and slide, creating that unsettling sound so familiar from horror films.
Why does the waterphone sound so terrifying?
It produces continuous glissandos, microtones and overtones that fall outside the Western musical scale. The water makes each note slide unpredictably, creating tension that the brain instinctively reads as a threat. This is why it is the favourite instrument of horror and sci-fi sound designers.
Is the waterphone difficult to play?
For atmospheric sounds it is one of the easiest instruments around: anyone can bow a rod and produce a spectacular effect in seconds. Fine control — mastering the water movement, specific harmonics and dynamics — requires practice, but there is no notation or scales to learn.
How much does a waterphone cost?
A handcrafted mid-size waterphone costs between €200 and €500, with large concert models going over €600. Smaller starter versions are cheaper, and many musicians use VST libraries when they only need the effect in a mix.
Do you need water to play it?
Not strictly, but water is what defines its sound. Without water it sounds metallic and static; with a little water and a tilt, the tones curve and slide into the ghostly effect it is famous for.
Who invented the waterphone?
American artist and luthier Richard Waters invented and patented it in the late 1960s, drawing inspiration from the Tibetan water drum and the Thai ranat. He registered the Waterphone trademark, though many similar instruments from other makers exist today.
Who is the waterphone for?
The waterphone is ideal for experimental musicians, sound designers, film composers and sound enthusiasts who want an instrument capable of creating atmospheres nothing else can match. You do not need musical training to enjoy it: a single bow stroke and you are already creating the sound of horror cinema. It also appeals to sound therapists, producers seeking organic textures and lovers of the rare and beautiful. If this instrument captivates you, you will probably love the theremin and the handpan too — the same sonic magic, just different ways of playing it.