Welcome to Interval Archive

The Interval Archive represents a specific time and place in the history of microtonal music. The time; the last quarter of the 20th Century, the place; the West Coast. This is also the story of the journey of Jonathan Glasier, who has collected and presented this information and chronicled this movement as it happened.

In this microtonal time period, before functioning microtonal electronics which would make the development much easier, there were two specific instrument categories that were mostly used for creating new non-twelve scales for general use, strings and percussion. Other than the violin family of bowed strings, which of course are thoroughly microtonal, plucked strings of the guitar and harp and psaltery strings were used extensively. Microtonal percussion instruments were mostly metallophones and marimbas made of wood, bamboo and glass.

The process of being a serious microtonal creator was very holistic. Once you had created your scale, you would invent and/or build a viable instrument, learn to play it well enough to perform; compose music for the instrument; find a venue for a performance (be your own manager), and usually cover all the details of PR and costs. Harry Partch paved the way, accomplishing many of these tasks and hardships first, so we knew what we were all getting into.

The Interval Archive aggregates the ideas, hardware, and music created by these very enterprising individuals on the West Coast who were all doing this work during the last quarter century. A nod must be given to the microtonal development on the East Coast at the time, mostly pulled together by Johnny Reinhard and Dean Drummond. The emphasis on the East Coast was more about presenting microtonal music by integrating conventional instruments into concerts and presentations. By the 1990’s the Partch instruments were in New York under the direction of Dean Drummond. Microtonality was alive and well during the same time as the activity on the West Coast. It was just a different flavor.

Interval Journal, Issue 1. Spring 1978. Cover features Ivor Darreg with his Megalyra.
Interval Journal, Issue 1. Spring 1978. Cover features Ivor Darreg with his Megalyra.

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Harry Partch was the catalytic spark for the emergence of microtonal activity in the last quarter of the 20th century.

These two facts exist–

  1. There were other important people who were already composing and playing microtonal music, and
  2. The development of the musical synthesizer during that time paved the way for making microtonality more accessible to musicians.

Also Adrian Fokker from The Netherlands shined a light on fellow countryman Christian Huygens, a scientific genius from the 16th century who discovered 31 tone equal temperament. Fokker began developing and sharing it with musicians in post World War II Europe. It became a national movement in that country. Microtonal Music, of course, has always been with us, especially in world music, and some say that all music is microtonal, but with the transition of the keyboard technology from the harpsichord to the piano, the standardization of 12 EDO was pretty much set in stone in the late 1800’s. From that time to recent times, 12 EDO has not only been the dominant scale but has sort of been imbued in our DNA. Is especially true recently since the automatic quantization of twelve in electronic music.

What I witnessed in my life, chronicled in the Interval years, was the well-spring of microtonal activity starting with my very early years, having Partch and his instruments in our household, and later in his ensemble and being one of his assistants at UCSD in the late 60’s. Those experiences launched me onto a pathway of continual discovery and action of gathering material and sharing it through my own music, journalism and production of microtonal events.

Microtonal People

Microtonal people are special in several ways. First of all, the process of creating and presenting microtonal music is a Holistic Endeavor. For example: you create a scale, develop an instrument to play that scale, write the music, often in a non-traditional notation, find someone, usually yourself or someone you can find who is willing to perform it, probably produce it and publicize it yourself. Why? Because it is not a popular idiom and the resources are always very limited. But, you do it anyway because you are that microtonal person that wants to hear and create something that is in a different “mood” or a different flavor. You are not hampered by a language of 12 notes. No, Partch pointed out that there is a “Vast sea between 1/1 and 2/1”. And, we realize that there are non-octave scales and you can use a vast array of math to formulate any scale you can think of. It is that freedom of choice and wonder that drives the microtonal person.

The Interval Archive is about these people during that time period who were driven to step outside the box to create the unheard combinations of pitches that is the focus of this website. You will get a view into the work these people have done creating new scales, new instruments, letters
that they have written to each other, and evidence of their struggles and triumphs. Their work has laid the groundwork for the landscape of microtonal music today which has opened up to a new generation of possibilities.

– Jonathan Glasier (JDG)

Recent Uploads

Scanned page of handwritten and typed commentary discussing T.S. Eliot's essay on literature and abstract thought.
Ivor Darreg. Commentary on 'The Meaning of a Literary Idea.' Scanned manuscript page.
Uploaded October 2026
Handwritten and typed notes by Ivor Darreg on the design philosophy and construction of Megalyra instruments, featuring microtonal tuning and color-coded fret systems.
Ivor Darreg. Background on the Megalyra Concept. Handwritten and typed biographical notes and design documentation for the Megalyra Group of instruments, featuring alternative tuning systems and visual design principles.
Uploaded October 2026
Scanned page from Musical 6-6 newsletter featuring dialog between Thomas Reed and Ivor Darreg on musical intervals and notation.
Thomas Reed and Ivor Darreg. Dialog on syntonic and Pythagorean commas, key-signatures, and just intonation. Musical 6-6 Newsletter, 1986.
Uploaded October 2026
First page of Ivor Darreg's Summer Summary newsletter for the Interval Foundation, August 1990, discussing xenharmonic music progress and tape distribution.
Ivor Darreg. Summer Summary for the Interval Foundation. August 1990.
Uploaded October 2026
Article page discussing Harry Partch's pitch selection and 43-tone tuning system versus equal temperament.
Xenharmonic Bulletin No. 11, June 1988. Article examining Harry Partch's pitch selection and the distinction between his 43-tone just intonation system and 43-tone equal temperament.
Uploaded October 2026
Page 2 of Ivor Darreg's article on electronic music and film, discussing new tuning systems, electronic orchestras, and notation.
Ivor Darreg. 'Electronic Music and the Films.' Film Music Notes, 1946, page 2.
Uploaded October 2026
Scanned page of Ivan Vyshnegradski's Author's Preface to Quartertone Harmony, discussing quartertone music theory and composition.
Ivan Vyshnegradski. Author's Preface to Quartertone Harmony, outlining the progressive study of quartertone music from classical harmony to modern applications.
Uploaded October 2026
Scanned page of text titled 'Twelve Pitches are No Longer Enough' by Ivor Darreg discussing microtonal music theory.
Ivor Darreg. 'Twelve Pitches are No Longer Enough.' Single Page Observations.
Uploaded October 2026
Cover art for Process Tools Utility publication, June 2026.
Photograph by Shannon Michael Terry

New Album

Process - Tools - Utility

Jonathan Glasier & Shannon Michael Terry

Listen now on Bandcamp. Pre-order the new release and support independent microtonal music.

Megalyra II / Hebdomekontany

Jonathan Glasier & Shannon Michael Terry

Jonathan Glasier experimenting with the Lumatone

Music Lessons

Personalized lessons in-person in San Diego or online anywhere you are. Learn vocal harmonics and 19edo microtonal practice with Jonathan Glasier, and anything about tuning theory and music history with Joseph Monzo.

Musical Instruments Gallery

Explore pictures and recordings of, and information about, microtonal instruments and their makers. Go to the gallery.