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 (soundtrack) as the closing credits. The first of these is the particularly famous sequence of the PanAm space plane docking at Space Station V. Ligeti's "Requiem" is heard three times, all of them during appearances of the monolith. The first is its encounter with apes just before the "Zarathustra"-accompanied ape discovery of the tool. The second is the monolith's discovery on the Moon, and the third is Bowman's approach to it around Jupiter just before he enters the Star Gate. This last sequence with the "Requiem" has much more movement in it than the first two, and it transitions directly into