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In music and music theory, a polychord consists of two or more chords, one on top of the other.Haerle, Dan (1982). The Jazz Language: A Theory Text for Jazz Composition and Improvisation, p. 30. . "The term polychord literally means many (poly) chords. In actual practice, a polychord is usually a combination of only two chords which creates a more complex sound."Guy Capuzzo, Tom Dempsey (2006). Theory for the Contemporary Guitarist, p. 76. . "A bichord (other-wise known as a polychord) consists of two triads played together."Edward Shanaphy, Joseph Knowlton (1990). The Do It Yourself Handbook for Keyboard Playing, p. 62. . "A polychord is nothing more than the playing of two chords at the same time." In shorthand they are written with the top chord above a line and the bottom chord below,Policastro, Michael A. (1999). Understanding How to Build Guitar Chords and Arpeggios, p. 168. . for example F upon C: .
The use of polychords may suggest polytonality or polytonality. parallel harmony may suggest bichords.
Examples may be found in Igor Stravinsky's Petrushka, p. 15, and Rite of Spring, "Dance of the Adolescents" (1921) Reisberg, Horace (1975). "The Vertical Dimension in Twentieth Century Music", Aspects of Twentieth-Century Music, p. 336. Wittlich, Gary (ed.). Englewood Cliffs, New Jersey: Prentice-Hall. . (see Petrushka chord).
In the polychords in the image above, the first might suggest a thirteenth chord, the second may suggest a D minor ninth chord with upper extensions, but the octave separation of the 3rd makes the suggestion of two independent triads a minor ninth apart even more likely, and the fourth is a split-third chord.
contain more than one triad, and so can be regarded as a type of polychord:
For example G7119 (G–B–D–F–A–C) is formed from G major (G–B–D) and D major (D–F–A), or . (C ≡ D)
The Lydian augmented scale, "has a polychord sound built in,"Munro, Doug (2002). Jazz Guitar: Bebop and Beyond, p. 36. . created by superimposing the Caug and the E () and/or Fdim () triads that exist in the scale, this being, "a very common practice for most Bebop and post-bop players such."Munro (2002), p. 38.
Examples of extended chords include the Elektra chord.
When one or both of the chords in a polychord are not "chords" in some exclusive sense according to some preferred chord theory or other, polychords devolves into Chordioid.
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