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 (soundtrack) the soundtrack album gives the former, the movie's credits give the latter). The theme is used both at the start and at the conclusion of the film. Also memorable in the film is its use of parts of Johann Strauss II's best-known waltz, "An der schönen blauen Donau (On the Beautiful Blue Danube)", during the extended space-station docking. Composers Richard and Johann Strauss are not related. In addition to the majestic yet fairly traditional compositions by the two Strausses and Aram Khachaturian, Kubrick used four highly modernistic compositions by György Ligeti which employ micropolyphony, the use of sustained dissonant chords