Until today, I had no idea that Elvis had been using "Also Sprach Zarathustra" (a.k.a. the opening theme from "2001: A Space Odyssey") at his concerts in the 1970s. Nor that asking an Amazon Echo Spot device to play "Also Sprach Zarathustra" would invoke the Elvis version. But of course it does.
Welcome to the 21st century, folks!