Heinz von Foerster Issues the First Book on Computer Music to Include Recordings of Compositions

In 1969 Austrian American physicist and philosopher Heinz von Foerster (born Heinz von Förster), director of the Biological Computer Laboratory at the University of Illinois at Urbana-Champaign, and James W. Beauchamp published Music by Computers.  This was probably the first book on computer music to include recordings of actual compositions. Four thin analog sound recordings (33-1/3 RPM) on thin flexible vinyl were included in a pocket in the inside back cover.

Hook & Norman, Origins of Cyberspace (2001) no. 608.