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Listen for what emerges.

When each ear receives a slightly different frequency, the brain perceives the relationship between them as a third tone.

From difference tones to dynamic systems.

ThirdTone begins with the binaural phenomenon and explores what emerges when overtone-rich acoustic architecture and interacting frequencies form a dynamic system.

Intersecting ripple fields across a resonating metal plate.

The body's frequency architecture

The brain and body are shaped by interacting frequencies. Like octaves in music, these frequencies can double or halve while preserving their underlying relationships. This harmonic architecture extends across the brain and body, from the frequencies associated with delta, theta, alpha, beta, and gamma to corresponding organ frequencies. ThirdTone activates this architecture through sound.

These brainwave states are frequencies within a larger architecture that the brain and body continually synchronize within, and transition between.

Current state Delta

Each step doubles the frequency while preserving the relationship.

Brainwaves that can be present during sleep and meditation

Entheoacoustics™

A relational ecology of sound

Entheoacoustics™ is the study and practice of the relational ecology of sound. It brings together neuroscience, psychoacoustics, systems thinking, artistic practice, and embodied listening.

Two streams create overlapping ripples around wood and seed pods in a stone basin.

Selected histories of listening and difference tones

  1. ~3000 BCE

    Peruvian shaman whistles

    Difference and beating patterns in ritual sound.

    Three Peruvian ceramic whistles on a glossy black surface.
  2. ~500 BCE

    Pythagoras

    The overtone series as relationship made audible.

    An ancient wooden monochord with a single string on a glossy black surface.
  3. 1714

    Tartini

    A documented third tone emerging between two pitches.

    A Baroque violin and bow on a glossy black surface.
  4. 1839

    Heinrich Wilhelm Dove

    Separate tones presented to each ear reveal a beat perceived within hearing.

    Two brass tuning forks with separate listening tubes on a glossy black surface.
  5. 1973

    Gerald Oster

    Binaural beats, perception, and the "cocktail party effect".

    Vintage headphones beside an analog oscilloscope showing two waveforms.
  6. Now

    ThirdTone

    From isolated frequencies to cross-coupled dynamic systems.

    Two acoustic transducers facing a rippling metal membrane.

Instruments become natureNature becomes instruments

Overtone-rich instruments played with intention

Every track begins with live acoustic instruments. The double bass is the foundation of ThirdTone's frequencies and our signature sound. Other instruments and natural materials add texture, movement, and life.

Double Bass in the ThirdTone acoustic archive

Double Bass

Double Bass

What ThirdTone is exploring

ThirdTone is studying how difference tones, overtone-rich acoustic relationships, and active listening meet as a system.

Visit the research library.

Studies that inform the practice

Carry the listening into practice.

Inside the ThirdTone app, the relationships explored on this page become formulas, journeys, and guided listening you can return to every day.

Download and listen to ThirdTone.
ThirdTone app listening experience