Intervals

Bibliography & method

Read past
the interface.

Every experiment is an invitation to verify the claim. This page holds the sources behind all of them.

Book · lecture I

Leonard Bernstein

The Unanswered Question: Six Talks at Harvard

“Musical Phonology” supplies the opening architecture: the child’s call, vibrating string, sympathetic resonance, harmonic series, octave, fifth, triad, and the analogy between musical and linguistic universals.

Harvard University Press · lectures delivered 1973
Book · chapters III–IV

Arnold Schoenberg

Theory of Harmony

“Consonance and Dissonance” supplies the argument that near and remote partials differ in degree rather than kind; the next chapter explores scale and chord as horizontal and vertical interpretations of a tone.

First published 1911 · English translation by Roy E. Carter

Core reference layer

Wikipedia reading trail

Used as the public, linkable backbone for definitions, equations, and chronology. Each article points onward to specialist sources.

1Interval (music)Definitions, naming, ratios, cents, classification2Harmonic series (music)Partials, tuning variance, timbre, combination tones3String vibrationLength, tension, density, wavelength, harmonic modes4Consonance and dissonanceHistorical, psychoacoustic, and cultural accounts5Pythagorean tuningStacks of fifths, commas, wolf intervals6Just intonationWhole-number interval ratios and tuning practice7Equal temperamentOctave division and modern keyboard compromise8Music and mathematicsHistorical relationship between number and sound

Three rules behind every exhibit

  1. 1

    Hear the number. A displayed frequency should be playable; a visual ratio should change the sound.

  2. 2

    Separate fact from story. Acoustics, psychoacoustics, history, and metaphor explain different layers.

  3. 3

    Keep the door open. Western tonal theory is one deep tradition, not the definition of music.

Bibliography · Reference map

See where each claim is written down.

Add or remove remembered ratios, then play the constellation together and one note at a time. Notice how settled or tense each remembered relationship sounds. Every point recalls an interval carried from another room; the controls redraw that accumulated record without changing it. The map gathers the sounds you tested across the museum into one picture.

Add or remove remembered ratios, then play them together and one note at a time. Hear how settled or tense each relationship sounds. Every point carries an interval from another room without changing its record. The map gathers the sounds you tested across the museum.

Review the ratios3-point constellation