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 (novel) a Space Shuttle launch, the adhesive sauces used to keep food firmly in place on one's plate, and even the zero-gravity toilet. Over the course of the novel, several minor characters either appear very briefly or are named only in passing, including other man-apes, spaceflight staff, lunar station security, and "Discovery" crew members. Among the novel's minor characters, some of the more consequential are listed below (often having direct film equivalents, or else being recurring characters in the "Odyssey" novel series). A sequel to the book, entitled "", was published in 1982 and adapted as a motion picture in 1984.