Some intervals feel like home. Others pull at you, glowing with a tension you can hear but rarely name. Interference is a guided listening journey into exactly that feeling—the moment two tones meet and something either settles or shimmers—and it lets you hear every step for yourself.

This is an audiobook built to be heard, not just read aloud. Each chapter pairs a short, contemplative reflection on a single interval with a recorded audio example of that exact frequency relationship, so the listener doesn't just learn what a perfect fifth or a neutral seventh is—they hear it ring. You move outward from the familiar stability of the octave, fifth, and third into stranger, more beautiful territory: the intervals that live between the keys of a piano, beyond the reach of equal temperament.

From there the book opens into the deeper structure of sound. It follows the harmonic series through the pure ratios of just intonation and into the higher limits—the seventh, eleventh, and thirteenth partials—where pitch and timbre begin to blur and Western categories of "major" and "minor" quietly dissolve. Drawing on the author's doctoral research between the Free University of Brussels and the Royal Conservatory of Brussels, it treats microtonality not as an exotic curiosity but as the hidden geometry underneath all music—resonance made audible, and almost visible.

Designed for composers, music theorists, acoustic researchers, tuning and synthesis enthusiasts, and anyone who has ever wondered why certain frequency relationships feel consonant while others ache with tension, Interference turns abstract ratios into something you can sit inside and listen to.