Ivor Darreg
Brief Bio by Jonathan Glasier
Ivor Darreg was born and raised to age eighteen by his parents in Portland, Oregon. Ivor’s father was editor of a Catholic weekly in the Northwest, and there was plenty of opportunity for intellectual pursuits. At the age of seven, Ivor started playing the piano. His interest was fanned by his artistic mother (an oil painter), but his father never understood how important Ivor’s music was to him. From age eight, Ivor helped with the proofing of the weekly and was already reading a wide range of material by the age of ten.
It was at this time that Ivor began to develop his interest in foreign languages. Ivor’s father was on the textbook commission, and Dr. Schmidt, a friend of his father who was a professor of languages, taught Ivor German. Because of his father’s interest in French history, Ivor was exposed to the French language, and at age twelve, his mother was learning sculpture from a Russian, and Ivor learned the fundamentals of the Russian language. At fourteen, Ivor met the people who ran the Esperanto club of Portland, and at twenty-three he learned Spanish. Throughout the years, Ivor has done translations for a number of people, and his language prowess has often helped the editors of Interval.
But it was music that was to be the focus of this brilliant young man, and being of scientific bent, he was interested in the hows and whys of the nature of same. At age fourteen, Ivor began playing the cello, and his first trials at composition had already been tried by that time. As his interest and dedication to music grew, the rift between Ivor and his father grew, so that by the time Ivor was seventeen, he and his mother made a split from his father and there was very little contact thereafter. Ivor and his mother moved to San Francisco to rooming houses and hotels, and by this time Ivor had changed his name from Girard to Darreg (sort of a retrograde). Both Ivor’s father and his uncle, who was a bishop in Great Falls, Montana, had visions of Ivor being a priest and carrying on in the family religious tradition, but Ivor’s heart was elsewhere.
Ivor’s interest in the new field of electronics was growing at this time. It began when, at age eleven, Ivor heard the theremin played on the radio. At age fourteen he met a man with a ham radio licence and began learning about the fundamentals of electronics. This interest was fueled by magazines, acquaintances, and meetings with the Portland Ham Radio Club. Practicing with oscillators and listening to ring modulator effects spurred an interest that culminated in the building of the Electric Keyboard Oboe.
Instruments
Recordings & Media
- 1979 JanMoustache Blue – Ivor Darreg & Glen A. Prior, 1979

Articles & Writing
Film Music Notes by Ivor Darreg, 1946 Ivor Darreg, 1946 Feb
Ivor Darreg’s List, October 1949: Electronics Workshop Tasks Ivor Darreg, 1949 Oct
F.C. Judd, Electronic Music and Musique Concrète – Review by Ivor Darreg Ivor Darreg, 1961 Jan
Reprint from The Exposition Boulevard Expose ‘Definitions’ by Ivor Darreg Ivor Darreg, 1962 Jan
List of Tape Compositions by Ivor Darreg, Up to March 1967 Ivor Darreg, 1967 Mar
Xenharmonics: Exploring Microtonal Resources by Ivor Darreg, 1979 (from Exhibition Catalog) Ivor Darreg, 1979 Jan
Ivor Darreg on Xenharmonics, 1981 Ivor Darreg, 1981 Aug
Ivor Darreg notes on Xenharmonics, August 1981 Ivor Darreg, 1981 Aug
We Dare to Compare: List of Comparisons of Different EDO’s Ivor Darreg, 1988 Jul
Using Two-Part Counterpoint for Non-Twelve-Tone Music Ivor Darreg, 1989 Jan
All Systems Go by Ivor Darreg, Xenharmonic Frontier Ivor Darreg, 1990 Jan
The Electric Keyboard Drum Ivor Darreg, 1991 Jan
Darreg ARRAY Diagram, Op. 10 Cipher, rear view, c. 1995 Ivor Darreg, 1995 Jan
Note from Erv Wilson to Ivor Darreg, Logarithms to the Base 2 of Numbers 1-64 Erv Wilson, 1964 Oct
Brian Hartzler. ‘Longing’ (origin unsure). Guitar composition, c.1976. Brian Hartzler, 1976 Jan
25. Bart Hopkin. EMI Cassette Project Guidelines, 1993. Bart Hopkin, 1993 Apr
Ivor Darreg Bio and Comment on Russolo Ivor Darreg
Ivor Darreg’s More Recent Musical Publications Ivor Darreg
Ivor Darreg Tapes That Explore Ivor Darreg
List of References on Tuning Systems and Scales Ivor Darreg
Greek Derived Words Pertaining to Music by Ivor Darreg Ivor Darreg
Ivor Darreg Definitions of Metachromatic and Xenharmonics Ivor Darreg
Brand Library Concert: Ivor Darreg and Erv Wilson. Interval Magazine Vol. II No. 2-3
EDOs 5–64: Major thirds analysis by Dave Hill Dave Hill
CD List: Role of Note Frequency Ratios in Musical Harmonies – Dave Hill Dave Hill
Fifths (5-64 edo) by Dave Hill Dave Hill
Major Thirds (5-64 EDO) by Dave Hill Dave Hill
Letters
Ivor Darreg was a prolific correspondent. His letters in part, are here.
Photos
Performances & Exhibitions
Glen Prior Concert, Los Angeles City College, October 6, 1977 1977 Oct
Sound: An Exhibition of Sound Sculpture, Instrument Building and Acoustically Tuned Spaces. Full Catalog, 1979 1979 Jul
Interval Foundation Presents: The Microtonal Music of the Future Concert, 1979 1979 Jul
Sonic Arts Gallery Announcement of Opening by Jonathan Glasier Jonathan Glasier, 1979 Sep
Jo Ann Smith. ‘New World Concerts.’ Sound exhibit review, LAICA, 1981. Jo Ann Smith, 1981 Jan
Concert Review, “Microtonal” by Newband, 29 April, 1982 with note from Ivor Darreg in margin Edward Rothstein, 1982 Apr
Brand Library Concert: Ivor Darreg and Erv Wilson. Interval Magazine V.II #2–3 1986 Dec
Grand Opening of Sonic Arts Gallery I, September 17, 1987 1987 Sep
Grand Opening of Sonic Arts Gallery I, September 17, 1987 1987 Sep
Zounds exhibition opening announcement, Sonic Arts Gallery, September 1987 1987 Sep
Los Angeles Times, Sonic Arts Gallery, October 3, 1987 Hilliard Harper, 1987 Oct
Black Box Exhibit at Sonic Arts Gallery I 1988 — Instrument Labels 1988 Apr
Sonic Arts Gallery Spring Concert Series 1988 1988 Apr
Interval Players Summit Laboratories Concert Julian CA 1988 1988 Aug
Transpectra and David Scheirman Julian Recording Event 1982 1988 Aug
Sonic Arts Gallery Fall 1988 Concert Series with Black Box Exhibit 1988 Sep
Sonic Arts Gallery Black Box Exhibit Fall Concert Schedule 1988 Sep
Sonic Arts Gallery Fall Concert Series 1988 Oct
New Sounds in New Shapes Exhibition Press Release, Hollywood Bowl Museum, 1992 Jonathan Glasier, 1992 Apr
New Sounds in New Shapes Exhibition, Hollywood Bowl Museum 1992 1992 Sep
New Sound in New Shapes Exhibition, Hollywood Bowl Museum, 1992 1992 Sep
Ain’t Misbehavin’ Bang on a Can American Festival of Microtonal Music, by Kyle Gann Kyle Gann, 1994 Aug
Sonic Arts Gallery II Concert Program: Brian McLaren, Jonathan Glasier, 1994 Jonathan Glasier, 1994 Oct
Sonic Arts Gallery II Concert Program, October 25, 1994 1994 Oct
ID Circuit Street Performance Promo, Sonic Arts Gallery II, December 2005 2005 Dec
21. Electro Acoustic Music Experience at Palomar College with Brink and Jonathan Glasier 2006 Nov
San Diego Microfest at the Kalimba Center for the Arts, 2016 2016 Jan
The Endless Scale Concert Program, May 23, 1978 — Ivor Darreg
Tubulongs: Microtonal Percussion Instruments Exhibition, Sonic Arts Gallery 1988
Compositions | Scores
Brian Hartzler. ‘Longing’ (origin unsure). Guitar composition, c.1976. Brian Hartzler, 1976 Jan
Prelude for Guitar With 19 Frets Per Octave Ivor Darreg, 1976 Jan
Mentioned in...
Viking Song example from Icelandic source Eggert Stefansson, 1933 Feb
Futurism Short Dictionary of Literary Terms 1952 1952 Jan
International Electronic Music Catalog 1967 Entry for Ivor Darreg 1967 Jan
Interval_a_Microtonal_Newsletter_Vol_I_no.1 1970 Jan
And It Comes Out Here – LA Times, August 12, 1979 Suzanne Muchnic, 1979 Aug
Interval Foundation Notes Fall 1980 and Spring 1982 Jonathan Glasier, 1980 Sep
Guitars of Tomorrow. Guitar Player Magazine, October 1982 Tom Mulhern, 1982 Oct
Tuning and Temperament Bibliography by Douglas Leedy Douglas Leedy, 1983 Apr
Interval Interview With French Composer Pierre-Jean Croset and His Lyra Jonathan Glasier, 1984 Jan
Experimental Musical Instruments, 1985 1985 Jan
Liszt discovery to 90 on the auction block; Composers discuss music of computers Charles Shera, 1987 Dec
Sound Sculpture exhibition at Sonic Arts Gallery, 1988 Ingrid Whitehead, 1988 Nov
Weekend of Musical Exploration at the Rim Institute, June 1990 1990 May
Ivor Darreg Obituary, San Diego Union-Tribune, February 16, 1994 1994 Feb
15. Some People Have Seen His Ghost Here, San Diego Reader, June 1995 Judy Henske, 1995 Jun
15. Some People Have Seen His Ghost Here, San Diego Reader 1995 1995 Jun
Improvitory Concert Series. Jonathan Glasier interview. SAGII Expresso, September 1999. Rick Heller, 1999 Sep
interval-journal-1
Marching to a Different Ratio. Computer Music Journal Vol. II No. 2, p. 7-8 Curtis Abbott
Some Quarter-Tone Impressions by Charles Ives (Ivor Darreg notes) Charles Ives
The Nineteen-Tone Instruments of W.A. Piehl and Tillman Schafer
Brand Library Concert: Ivor Darreg and Erv Wilson. Interval Magazine Vol. II No. 2-3
Computer Music Journal Vol. II No. 2: Marching to a Different Ratio Curtis Abbott
Ivor Darreg Bio by Jonathan Glasier Jonathan Glasier
List of Musical Compositions by Ivor Darreg
Ivor Darreg Selected Publications List
EDOs 5–64: Major thirds analysis by Dave Hill Dave Hill
CD List: Role of Note Frequency Ratios in Musical Harmonies – Dave Hill Dave Hill
Fifths (5-64 edo) by Dave Hill Dave Hill
Major Thirds (5-64 EDO) by Dave Hill Dave Hill
Microtone. Harvard Dictionary of Music (comments by Ivor Darreg)
Musical Encyclopedia ‘Microtonal’ by Hugh Davies, pp. 653 Hugh Davies
Other
Viking Song example from Icelandic source Eggert Stefansson, 1933 Feb
Futurism Short Dictionary of Literary Terms 1952 1952 Jan
List of Tape Compositions by Ivor Darreg, Up to March 1967 Ivor Darreg, 1967 Mar
Tuning and Temperament Bibliography by Douglas Leedy Douglas Leedy, 1983 Apr
Ivor Darreg Obituary, San Diego Union-Tribune, February 16, 1994 1994 Feb
Ivor Darreg Bio by Jonathan Glasier Jonathan Glasier
List of Musical Compositions by Ivor Darreg
Ivor Darreg Selected Publications List
Ivor Darreg Tapes That Explore Ivor Darreg
List of References on Tuning Systems and Scales Ivor Darreg
Ivor Darreg Definitions of Metachromatic and Xenharmonics Ivor Darreg
Microtone. Harvard Dictionary of Music (comments by Ivor Darreg)