 Stanley Kubrick (qv) asked Pink Floyd (qv) if he could use their  "Atom Heart Mother Suite" in the soundtrack. However, because  Kubrick wanted unlimited license to determine what portions or edits  of the song he used, the band turned him down. When Alex is in the  record store (the same shot where the 2001 soundtrack appears), the  upper shelf has the cover of "Atom Heart Mother" (look for the cow  in the field).