Classical music (music created by musicians who are commonly not classically trained, often from a purely oral tradition). Some composers, like Dvořák and Smetana, have used folk themes to impart a nationalist flavor to their work, while others like Bartók have used specific themes lifted whole from their folk-music origins. Certain staples of classical music are often used commercially (either in advertising or in movie soundtracks). In television commercials, several passages have become clichéd, particularly the opening of Richard Strauss' "Also sprach Zarathustra" (made famous in the film "") and the opening section "O Fortuna" of Carl Orff's "Carmina Burana"; other examples
2001: A Space Odyssey (film) as a pessimistic account of human nature and humanity's future. The most extreme of these interpretations state that the fetus floating above the Earth will destroy it." Many of the cataclysmic interpretations of the film appeared inspired by Kubrick's direction of the Cold War film "Dr. Strangelove" just before "2001", which resulted in dark speculation about the use of nuclear weapons orbiting the Earth in "2001". These interpretations were challenged by Clarke, who said: "Many readers have interpreted the last paragraph of the book to mean that he (the fetus) destroyed Earth, perhaps for the purpose of creating a new