That would be David Borden, an American composer of minimalist/electronic music. He was the founder and leader of Mother Mallard's Portable Masterpice Co., an early all-synthesizer (Moog) ensemble.
So there's been no release of the few pieces he composed for the film, or it can't be heard anywhere apart from the movie? I for one would like to hear what he composed.
I so appreciate this thread, as I've tried over the years to track down the original recordings of all the music used in the film, and have never been able to find anything on Borden's contributions (listed in the credits as "Study No.1 / Study No.2"). Aside from Borden's and Jack Nitzsche's work (outiside of "Iraq" from the soundtrack album) I've been able to track down the original recordings used for all the other music (never cared much for the re-recorded versions of Penderecki's or Henze's music on the soundtrack album).
However, I always thought that the music heard during Merrin's arrival to the house was another portion of Jack Nitzsche's "Crystal Glass and Voices"(?).
So there's been no release of the few pieces he composed for the film, or it can't be heard anywhere apart from the movie? I for one would like to hear what he composed.
I would too. Can we all take up a letter writing campaign and see if he'll put them on his website or something? He's still alive last I checked. Here's the website of Mother Mallard, the synthesizer band he was in: http://mothermallard.com/Mother_Mallard.html