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.