Ivor Darreg has been played on NTS shows including Séance Centre, with Prelude #2 For 19-Tone Guitar first played on 6 March 2019.

Ivor Darreg (May 5, 1917 – February 12, 1994) was a leading proponent of and composer of microtonal or "xenharmonic" music. He also created a series of experimental musical instruments.

Darreg, a contemporary of Harry Partch and a close colleague of John H. Chalmers and Erv Wilson, was one of America's leading theorists and practitioners of experimental intonation and experimental instrument building. Frequently he published his writings in his own Xenharmonic Bulletin.

Darreg was born Kenneth Vincent Gerard O'Hara in Portland, Oregon. His father…