Welcome to Interval Archive

An archive of the microtonal music journal INTERVAL and information by and about microtonal musicians. 

The Interval Archive is a compendium of *microtonal music-related compositions, articles, and letters during the years of Interval Journal 1978-1986, and up to the present writings, recordings, and activities.
Sections will be devoted to microtonal stalwarts Ivor Darreg, Harry Partch, Buzz Kimball, Erv Wilson, and others.

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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Recent Uploads

Ivor Darreg's electric keyboard drum instrument from 1941.
Ivor Darreg. Electric Keyboard Drum, 1941.
Uploaded May 2026
Promotional poster for Zoundonia sonic playground event at Sonic Arts Gallery, April 22-23.
Zoundonia: A Sonic Playground for the Whole Family. Sonic Arts Gallery Annex, April 22–23. Sonic environment by Jonathan Glasier and John Gibben.
Uploaded May 2026
Exhibition poster for David Felker installation at Sonic Arts Gallery, San Diego, March-April 1989.
David Felker. Sonance from the Vessel: An Alchemic Voyage. Sonic Arts Gallery, San Diego. March 10 – April 1, 1989.
Uploaded May 2026
Text document about Ivor Darreg's Electric Keyboard Drum instrument, 1991.
Ivor Darreg. The Electric Keyboard Drum. 1991.
Uploaded May 2026
Flyer advertising children's musical workshops and instrument construction classes at Sonic Arts Gallery I.
Jonathan Glasier. Musical Workshops for Children. Sonic Arts Gallery I, San Diego, 1987.
Uploaded April 2026
Flyer for Sonic Choir Class at Sonic Arts Gallery, directed by Jonathan Glasier, featuring vocal harmonics and sound healing instruction.
Jonathan Glasier. Sonic Choir Class flyer. Sonic Arts Gallery I, San Diego, 1970s–1980s.
Uploaded April 2026
Flyer describing five instrument-making workshops led by Jonathan Glasier at Sonic Arts Gallery I in San Diego.
Jonathan Glasier. Instrument Making Workshops for Sonic Arts Gallery I. Sonic Arts Gallery, San Diego.
Uploaded April 2026
Announcement for Sonic Arts Gallery exhibit of Stephen Kent Goodman's Automated Sound Sculptures, December 5, 1987.
Sonic Arts Gallery. Announcement for exhibit of Stephen Kent Goodman's Automated Music Ensemble, a five-year project of wind, string, and percussion sound sculptures controlled by a touch-sensitive keyboard. December 5, 1987.
Uploaded April 2026
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.