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) A Space Odyssey" has been analyzed and interpreted by professional critics and theorists, amateur writers and science fiction fans. Peter Kramer in his monograph for BFI analyzing the film summarized the diverse interpretations as ranging from those who saw it as darkly apocalyptic in tone to those who saw it as an optimistic reappraisal of the hopes of mankind and humanity. Questions about "2001" range from uncertainty about its implications for humanity's origins and destiny in the universe to interpreting elements of the film's more enigmatic scenes, such as the meaning of the monolith, or the fate of astronaut David