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
2001: A Space Odyssey in popular culture appearance on the cover of "The Whole Earth Catalog". Noting that images of the entire planet recur several times in "A Space Odyssey", Jacobs writes: In August 2011, in response to Apple Inc.'s patent infringement lawsuit against Samsung, the latter argued that Apple's iPad was effectively modeled on the visual tablets that appear aboard spaceship "Discovery" in the "Space Odyssey" film, which constitute prior art. "Siri", Apple's natural language voice control system for the iPhone 4S, features a reference to the film: it responds "I'm sorry I can't do that" when asked to "open the pod bay doors". When asked