I was looking at an article on CD-4 cartridges in the March 1974 issue of Audio Magazine, and I noticed that two of their test records were Wendy Carlos' "Switched On Bach" and "Clockwork Orange." Both were designated "Experimental Record". Given that Columbia didn't release any CD-4 albums, I wonder how these came to be? And "Clockwork Orange" was never released in quad, but this article shows that at least one test pressing was made.
Direct link to the .pdf of this issue:
http://www.americanradiohistory.com/Archive-Audio/70s/Audio-1974-03.pdf (reference on page 39)
Direct link to the .pdf of this issue:
http://www.americanradiohistory.com/Archive-Audio/70s/Audio-1974-03.pdf (reference on page 39)