HarmonyIntermediate3 min read

Mixolydian in rock: bVII, the double plagal, and riffs

The Mixolydian mode

G Mixolydian: G A B C D E F (1 2 3 4 5 6 b7). It is a major scale with a minor seventh: the characteristic note is the b7 (F in G). The leading tone (F#) is missing, so there is no major V7: the dominant is minor (Dm).

Chords in G Mixolydian

ChordDegreeRole
GItonic (often G7 or G with a b7 in the melody)
Amii
B°iii°rare
CIVsubdominant, very important
Dmvminor “dominant,” weak
Emvi
FbVIIcharacteristic chord

The typical progressions revolve around I – bVII – IV – I and I – bVII – I.

Mixolydian rock progressions (in D, the most “guitar-friendly” key)

ProgressionChordsNotes
I – bVII – IV – ID – C – G – Dthe Mixolydian loop par excellence
I – bVII – ID – C – Dopen riff
bVII – IV – I (double plagal)C – G – Dtwo descending fifths toward the tonic
I – v – IVD – Am – G“folk-rock” color
I – IV – bVII – IVD – G – C – G“Gloria” style

Real examples

  • Guns N’ Roses, Sweet Child O’ Mine (1987): the verse goes around D – C – G – D (with the band tuned a half step down, so it sounds in Db).
  • The Rolling Stones, Sympathy for the Devil (1968): E – D – A – E.
  • Them, Gloria (1964): E – D – A.
  • The Beatles, Hey Jude (1968): in the long coda in F, F – Eb – Bb – F (I – bVII – IV – I): the double plagal.
  • The Beatles, Norwegian Wood (1965): melody in E Mixolydian (with D natural).
  • Lynyrd Skynyrd, Sweet Home Alabama (1974): D – C – G: analysts debate whether it is D Mixolydian (I – bVII – IV) or G major (V – IV – I); the melody and the bass tip the balance toward D, but the ambiguity is part of the charm.

Why rock loves Mixolydian

  • Guitars easily play open major chords a whole step apart (D – C, E – D, A – G).
  • The blues uses the b7 over major chords: Mixolydian is its diatonic “relative.”
  • The lack of a leading tone gives a direct, earthy, unsentimental sound.

Melodic writing

  • Make the b7 heard over the I (F over G, C over D): it is the mode’s signature.
  • The major 3rd (B over G) distinguishes Mixolydian from Dorian.
  • Major pentatonic + b7 riffs (G A B D E F) work well.

Common mistakes

  • Using a major V7 (D7 in G Mixolydian): it introduces F# and leads into G major.
  • Confusing Mixolydian with the key of the IV: if the piece often stops on C, the ear may hear C major as the tonic (bVII becomes I, the I becomes V). Reinforce the tonic with the bass, riffs, and the start/end of phrases.

Producer exercise

  1. Crunch electric guitar (or Arturia Mini V with a “power” sound), 120 BPM.
  2. Riff on D – C – G – D, one chord per bar, accents on the eighth notes.
  3. Bass playing the roots with a C – B – A passing line toward G.
  4. Vocal melody that rests on the C (b7) over the D chord at least once per phrase.

The modes of the major scale, plagal cadence and minor plagal, modal harmony and modal loops, the blues, harmony in metal.

Sources

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