The Invisible Bow: 88 Magnets Have Changed the Voice of the Grand Piano

Author: Inna Horoshkina One

Магнитно-резонансный рояль: 88 электромагнитов пробуждают скрытые голоса струн.

The pianist touches a key — but the familiar strike is almost inaudible.

Instead, a sound gradually emerges from the depths of the grand piano. It seems to materialize out of silence, gathers strength, changes color, splits into barely discernible overtones, and continues to live longer than an ordinary piano note is capable of sounding.

It seems as though the instrument has learned to breathe.

But this is not a synthesizer, nor a computer imitation of a grand piano. The sound is born inside real wooden soundboards and metal strings — without loudspeakers. It is created by the Magnetic Resonator Piano, a magnetic-resonance grand piano that expands the familiar capabilities of an acoustic instrument with the help of 88 electromagnets.

On 13 October 2026, at the Milton Court concert hall in London, its extraordinary voice becomes the centerpiece of a special program, Electronics at Eight: Music for Magnetic Resonator Piano.

A concert in which the grand piano reveals a new dimension

The main performer of the evening is the pianist and composer Xenia Pestova Bennett, one of the leading researchers into the possibilities of the magnetic resonator piano.

The program features existing works for the instrument and several world premieres created by students and faculty of the Guildhall School of Music & Drama. Also presented is a composition by Pestova Bennett herself for magnetic resonator piano, ensemble, and video, performed together with the Bauhaus Band under the direction of the saxophonist and composer John Harle.

Thus the evening becomes more than just a demonstration of an unusual technology. It is a full-fledged exploration of a new musical language — an attempt to understand what will happen if the familiar grand piano gains the ability to change its sound even after a key has been pressed.

Why an ordinary note ends

In a traditional piano, pressing a key sets a hammer in motion. It strikes a string — and the string begins to vibrate.

The musician can determine the force and character of the initial touch, and then lift the damper with a pedal and allow the note to sound longer. But after the strike itself, he is almost no longer able to directly alter the development of the sound. The note gradually fades according to the physical properties of the string and the instrument's body.

A violinist has a different possibility: by moving the bow, he can sustain the sound, strengthen it, weaken it, change the pressure and color already during the sounding.

The creator of the magnetic resonator piano, the composer and engineer Andrew McPherson, asked himself: could such continuity be given to the piano?

Thus appeared an instrument that combines the familiar keyboard with an entirely new way of controlling the strings.

Eighty-eight invisible touches

Above the strings of the grand piano are placed 88 electromagnetic actuators — one for each key of a standard instrument.

They make the strings vibrate without a hammer strike. The magnetic field acts like an invisible bow: it can gently awaken a string, sustain its vibration, and change the intensity of the sound.

Thanks to this, the grand piano is capable of creating:

— a sound gradually growing out of silence;

— a sustained, controlled sounding of a note;

— smooth crescendos after a key is pressed;

— pronounced overtones;

— changes of timbre;

— unusual bends of pitch.

At the same time, the source of the sound remains entirely acoustic. What is heard in the hall is not loudspeakers reproducing a digital effect, but the strings themselves and the resonating body of the grand piano.

The key becomes a sensitive surface

An important part of the system is an optical scanner that tracks the continuous position of every key.

An ordinary electronic interface mainly registers two events: the key is pressed and the key is released. The new system sees the entire path of movement — its speed, its depth, and the tiniest changes.

That is why even a very gentle gesture, one that would not make the hammer of a traditional grand piano strike the string, can give rise to a sound. The performer gains the ability to literally grow it with the movement of a finger.

Electronics do not distance the musician from the instrument. On the contrary, they make the contact even more sensitive: a small change in the position of the hand can transform the inner movement of the string.

A technology that does not replace the instrument

The magnetic-resonance module can be installed inside a concert grand piano without irreversibly altering its construction. The instrument retains its traditional sound and at the same time acquires an additional acoustic layer.

This is especially important at a moment when technology in music is often discussed as a possible replacement for the human being, the performer, or the familiar instrument.

Here the opposite happens.

The magnets do not play instead of the pianist. The algorithm does not make creative decisions for him. The system merely expands the connection between finger and string, allowing the performer to work with what was previously almost impossible to control: the life of a note after its appearance.

The grand piano does not become less real. It reveals itself more deeply.

A voice that was always inside

In the magnetic resonator piano, what is especially striking is not the complexity of the technology but its result: it allows us to hear qualities already contained in the acoustic body of the instrument.

The electromagnets do not bring a foreign timbre to the grand piano. They enter into interaction with its own strings, wood, soundboard and air volume. Every new shade arises thanks to the physical properties of the instrument itself.

It is like a ray of light directed at the facet of a crystal. The ray does not create the structure — it makes visible what was already contained within.

So too the magnetic field does not replace the voice of the grand piano. It opens access to its previously unheard possibilities.

Between the strike and silence

For centuries, piano music was built around touch and the subsequent fading away.

Magnetic Resonator Piano creates a new space between these two events. A note is no longer obliged to immediately begin its path toward disappearance. It can pause, turn around, gather strength and reveal its inner structure.

The musician receives not only more sounds, but also a different experience of time.

Instead of a sequence of short events, a continuous flow arises. The performer hears how one vibration changes from within, enters into interaction with neighbouring frequencies and gradually transforms the entire acoustic space.

Sound becomes not a point, but a process.

What did music remind us of today?

That development does not always require abandoning the former form.

Sometimes the new is born not instead of what already exists, but through a deeper revelation of its possibilities.

The grand piano remained a grand piano. The string — a string. Human hands still touch the keys. But the new interaction made it possible to hear in a familiar instrument a whole world that had previously remained beyond the boundary of perception.

Perhaps this is how all living things are revealed: not by becoming something foreign, but by manifesting ever more facets of their own nature.

The silence between the notes turned out not to be the end of sounding — it became the space in which the grand piano remembered how much music already lives inside it.

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