Polychord
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In music and music theory a bichord or polychord consists of two or more chords, one on top of the other, multiple chords. Extended chords contain more than one triad:
Image:Thirteenth-polychord.PNG
and thus the creation or perception of polychords depends on the chords separation through register or timbre. The use of polychords may suggest polytonality. Harmonic parallelism may suggest bichords.
Examples may be found in Igor Stravinsky's Petrushka, p.15, and Rite of Spring, "Dance of the Adolescents" (1921) (DeLone et. al. 1975, p.336).
See also: secundal, tertian, quartal.
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Source
- DeLone et. al. (Eds.) (1975). Aspects of Twentieth-Century Music. Englewood Cliffs, New Jersey: Prentice-Hall. ISBN 0130493465.de:Polychord (Harmonielehre)