The sound comes from Stanley Kubrick's 1968 film 2001: A Space Odyssey, which famously used Richard Strauss's Also sprach Zarathustra as its main theme. The opening Sunrise sequence, matching the music to the alignment of planets and the dawn of man, became one of cinema's most parodied moments. The cue spread far beyond film fans into trailers, ads and memes, where it is now shorthand for evolution, discovery and anything presented as a world-changing breakthrough.