citing Nigerian musicologist Chinyere Nwachukwu's definition of the Igbo term "nkwa" as an activity combining and/or requiring singing, playing musical instruments, and dancing. He then concludes that there exists "nonuniversality of music and the universality of nonmusic". Other terms Other terms used to discuss particular pieces include: Note—an abstraction that refers to either a specific pitch or rhythm, or the written symbol Chord—a simultaneity of notes heard as some sort of unit Chord progression—a succession of chords (simultaneity succession) For a more comprehensive list of terms see: Outline of music See also Combinatoriality New musicology Noise in music Permutation (music) Philosophy of music Process music Serialism Set (music) Sound art References Sources Cited in and , p. 78. Cited in . Cited in . Further reading Agricola, Martin (1991). The Rudiments of Music, new edition, translated from the Latin edition of 1539 by John Trowell. Aberystwyth: Boethius Press. American National Standards Institute, "American National Psychoacoustical Terminology". [N.p.]: American Standards Association Macpherson, Stewart, and Anthony Payne (1970). The Rudiments of Music, revised edition, with a new chapter by Anthony Payne. London: Stainer & Bell; New York: Galliard. . Ottman, Robert W., and Frank D. Mainous (2000). Rudiments of Music, second edition. Englewood Cliffs, NJ: Prentice-Hall. . White, John D. (1976). The Analysis of Music. Englewood Cliffs, New Jersey: Prentice-Hall. . External links The Elements of Music Musical analysis Musical composition Philosophy of music Serialism de:Universalien der Musikwahrnehmung