Review
Harmonic rhythm is the rate at which chords change. This lesson covers how to manipulate it to create form, tension, and groove.
Cadential acceleration
In the classical tradition and in pop, the harmonic rhythm accelerates toward the cadence:
- 8-bar phrase: chords every 2 bars (bars 1–4), every bar (5–6), every half bar (7), cadence (8).
- Example in C: | C | C | Am | Am | F | G | Em7 A7 | Dm7 G7 | C |
The acceleration creates a sense of “arrival” even without changing dynamics.
Deceleration and “breathing room”
- The chorus can have fewer changes than the verse (one chord for 2 bars) to sound bigger.
- In the EDM drop there is often a single chord or a 2-chord loop: the energy comes from the drums and bass.
Anticipation (push)
In pop, funk, salsa, and jazz the new chord arrives an eighth or a sixteenth note before the downbeat:
- Chord on the “and” of 4 (in eighth notes) instead of on beat 1 of the next bar.
- The bass can anticipate with the chord (a push from the whole band) or hold the downbeat (tension between instruments).
In the Piano roll: move the chord 1/8 to the left and lengthen it to the end of the following bar.
Harmonic rhythm against meter
- Cadential hemiola (Baroque): in 3/4 the two bars before the cadence change chord every 2 beats, creating a bar “in 3/2.” Very frequent in Handel, Bach, and Baroque dances.
- Chords every 3 eighth notes in 4/4 (3+3+2): the harmonic rhythm follows the tresillo; typical of reggaeton, dancehall, and modern pop.
- Offset harmonic rhythm between two instruments: the pad changes on 1, the bass on 2&: an “elastic” groove.
Hypermeter
Hypermeter is the grouping of bars into larger units (2, 4, 8). A chord change on a “strong” bar of the hypermeter (bar 1 of 4) sounds structural; on a weak bar it sounds passing.
- Expansion: adding 1–2 bars (deceptive cadence, repetition) breaks the 4+4 regularity.
- Elision: the last bar of a phrase is also the first of the next (the chorus enters over the cadence of the pre-chorus).
Harmonic rhythm by genre (typical values)
| Genre | Typical harmonic rhythm |
|---|---|
| Trap, drill | 1 chord every 1–2 bars, often a loop of 2–4 chords |
| Mainstream pop | 1 chord per bar, loop of 4 |
| J-pop, K-pop ballad | 2 chords per bar in the pre-chorus and the chorus |
| Jazz standard | 1–2 chords per bar, up to 4 in turnarounds |
| Fast bebop | 2 per bar at 250+ BPM |
| Funk, modal | 1 chord for 4–16 bars (vamp) |
| Modern gospel | 2–4 chords per bar (passing chords) |
Harmonic rhythm and lyrics
Chords preferably change on stressed syllables and on key words; a change on the wrong syllable weakens the prosody.
Producer exercise
- Take a loop of 4 chords (1 per bar).
- Version 1: anticipate each chord by 1/8.
- Version 2: in bars 3–4 put two chords per bar (acceleration).
- Version 3: shift only the bass 1/16 after the chord. Compare the groove in the three versions at 100 BPM.
Related topics
Harmonic rhythm (basic lesson), syncopation and anticipation, polyrhythm and hemiola, prolongation, meter and half-time.