Polychord

The use of polychords may suggest bitonality or polytonality.Examples may be found in Igor Stravinsky's Petrushka, p. 15, and Rite of Spring, "Dance of the Adolescents" (1921) [6] (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.[7] Extended chords contain more than one triad, and so can be regarded as a type of polychord: For example G7♯11♭9 (G–B–D–F–A♭–C♯) is formed from G major (G–B–D) and D♭ major (D♭–F–A♭), or ⁠D♭/G⁠.[5] (C♯ ≡ D♭) The Lydian augmented scale, "has a polychord sound built in,"[9] created by superimposing the Caug and the E (Playⓘ) and/or F♯dim (Playⓘ) triads that exist in the scale, this being, "a very common practice for most bop and post-bop players [such as McCoy Tyner].
Bitonal polychord: F major on top of C major. [ 1 ] Play ⓘ
Polychords: E minor, E ♭ major, E ♭ major, and D major over D minor. [ 7 ] Play ⓘ
Separate chords within an extended chord . [ 8 ] Play ⓘ
G 7 ♯ 11 ♭ 9 vs ⁠ D ♭ / G ⁠ chord. Play ⓘ
Fred Steiner 's 1957 Perry Mason theme , " Park Avenue Beat ", ends with a ⁠ D / Cm ⁠ polychord quoted by Frank Zappa in " Jezebel Boy ", Broadway the Hard Way (1988) and described by Walter Everett as "juicy". [ 11 ] Play ⓘ
MonochordCourse (music)music theorychordsbitonalityHarmonic parallelismIgor StravinskyPetrushkaRite of SpringPetrushka chordthirteenth chordninth chordsplit-third chordExtended chordsextended chordLydian augmented scalepost-bopMcCoy TynerElektra chordFred SteinerPerry MasonPark Avenue BeatFrank ZappaBroadway the Hard Waychordioid techniqueSecundalTertianQuartalUpper structureChordioidAugmentedDiminishedSuspendedSeventhDominantDominant seventh flat fiveHalf-diminishedDiminished majorMinor-majorAugmented majorAugmented minorAltered seventhNondominantHarmonic seventhExtendedEleventhThirteenthDominant 7♯9Tone clusterAugmented sixthLydianSeven sixBridgeComplexe sonoreElektraFarbenMysticNorthern lightsPsalmsSo WhatTristanViennese trichordMixed intervalSynthetic chordTetradfunctionDiatonicSupertonicMediantSubdominantSubmediantLeading toneSubtonicAlteredApproachBorrowedChromatic mediantNeapolitanPassingSecondarySecondary dominantSecondary leading-toneSecondary supertonicCommonContrastPrimary triadSubsidiarySubstituteChord-scale systemGuitarArpeggioChord names and symbolsList of chordsFactor