http://www.ixpres.com/interval/darreg/ Ivor Darreg Photographs and complete musical writings. http://www.furious.com/perfect/xenharmonics.html Ivor Darreg and Xenharmonics- Perfect Sound Forever Ivor Darreg and Xenoharmonics http://www.ccsi.com/~bobs/5_7brth.html Theremin Birthday Cameos May-July (1917-1994), Portland, Oregon. Biographies of Darreg and other theremin users. http://www.dnai.com/~jinetwk/xhcont.html Xenharmonikôn Contents Complete contents by issue.