2001: A Space Odyssey (soundtrack) used is Ligeti's "Lux Aeterna" and an electronically altered form of his "Aventures", the last of which was so used without Ligeti's permission and is not listed in the film's credits. Since the film, "Also sprach Zarathustra" has been used in many other contexts. It was used by the BBC and by CTV in Canada as the introductory theme music for their television coverage of the Apollo space missions, as well as stage entrance music for multiple acts including Elvis Presley late in his career. Jazz and rock variants of the theme have also been composed, the most well known
Interpretations of 2001: A Space Odyssey as "orbiting satellites carrying nuclear weapons" Actor Gary Lockwood (astronaut Frank Poole) in the audio DVD commentary says the first satellite is an armed weapon, making the famous match-cut from bone to satellite a "weapon-to-weapon cut". Several recent reviews of the film mostly of the DVD release refer to armed satellites, possibly influenced by Gary Lockwood's audio commentary. A few published works by scientists on the subject of space exploration or space weapons tangentially discuss "2001: A Space Odyssey" and assume at least some of the orbiting satellites are space weapons. Indeed, details worked out with input from space industry