5 Things to Know About Harry Partch’s Tuning System

It is based on just intonation, not equal temperament. Partch derived his pitch ratios from the natural harmonic series, avoiding the artificial divisions of standard piano tuning.

The system uses pure frequency ratios. Intervals are built on simple whole-number ratios like 3:2 or 5:4, which sound more consonant to the ear than equal-tempered intervals.

It requires specially built instruments. Standard instruments cannot play just intonation accurately, so Partch designed and constructed his own, like the chromelodeon and cloud chamber bowls.

The scale has 43 microtones per octave. Instead of the usual 12 semitones, Partch divided the octave into 43 distinct pitches, allowing for finer melodic and harmonic expression.

It rejects the compromises of equal temperament. Partch believed equal temperament dulls the natural beauty of harmony, so his system prioritizes pure acoustic relationships over convenience.