Parallel harmony

In music, parallel harmony, also known as harmonic parallelism, harmonic planing or parallel voice leading, is the parallel movement of two or more melodies (see voice leading).

This article is about parallel voice leading. For harmony related by common tones, see Parallel chord. For the beetle genus, see Diaphonia (beetle).

Illustrative example
Quartal chords descending by semitone

Lines with parallel harmony can be viewed as a series of chords with the same intervallic structure. Parallel means that each note within the chord rises or falls by the same interval.

Examples from works
Diatonic planing from "Feuilles mortes" ("Dead Leaves") by Claude Debussy.[1]
Triadic planing from Le Tombeau de Couperin by Maurice Ravel.[1]
{ \new PianoStaff << \new Staff << \relative c' { r2 <c e g c>(\ff <d f a d> <g b d g>2. <f a c f>4 <e g b e> <d f a d> <d f a d>2 <a c e a> <e' g b e>2) } >> \new Staff << \new Voice \relative c { \stemUp \clef bass \key c \major \time 3/2 \tempo "Sonore sans dureté" r2 <g c e g>^( <a d f a> <d g b d>2. <c f a c>4 <b e g b> <a d f a> <a d f a>2 <e a c e> <b' e g b>) } \new Voice \relative c, { \stemDown c1.-^_--~_\markup { \italic "8vb" } c~ c } >> >> }
The "organ chords" in Debussy's tenth prélude, La cathédrale engloutie

Prominent examples include:

In the Schuman example (Three Score Set for Piano), the inversions of the chords suggest a bichordal effect.[2]

In the example on the top right, we see a series of quartal chords in parallel motion, in which the intervallic relationship between each consecutive chord member, in this case a minor second, is consistent. Each note in the chord falls by one semitone in each step, from F, B♭, and E♭ in the first chord to D, G, and C in the last.

Usage in electronic music

Parallel harmony is frequently used in house music and other electronic music genres. Historically, this resulted from producers sampling chords from soul or jazz and then playing them at different pitches, or using "chord memory" feature from classic polyphonic synthesizers. Modern digital audio workstations offer similar chord-generating tools for achieving parallel harmony.[3]

See also

References
  1. Cope, David (2000). New Directions in Music, p. 6. ISBN 1-57766-108-7.
  2. Kliewer, Vernon (1975). "Melody: Linear Aspects of Twentieth-Century Music", Aspects of Twentieth-Century Music, pp. 332–333. Wittlich, Gary (ed.). Englewood Cliffs, New Jersey: Prentice-Hall. ISBN 0-13-049346-5.
  3. "Parallel Harmony". Ableton. Retrieved 2022-12-07.
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