The Mixolydian Drop
Flatten the seventh degree and build a chord on it, and the pull toward home disappears. What is left is wide, open and slightly ancient, which is why rock, folk and film music all reach for it when a song needs to sound big rather than resolved.
- 1 flat note
- no leading tone
- the rock sound
same family
- Mixolydian
- The Modal Folk Vamp
- Modal Interchange
The progression
I - bVII - IV - I
Why it works
The V chord in a major key pulls hard because it contains the leading tone, one half step under home. Flatten that note and the pull vanishes. The bVII is a whole step under the I, and a whole step slides rather than snaps. So the progression can circle indefinitely without ever begging to end, which is exactly what a riff wants.
Hear it in context
Three of our own examples: the loop as a rock riff, as a folk strum, and directly next to a I - V - IV so you can hear the missing pull.
Make it yours
- Go bVII - IV - I in one gesture
That triple is a cadence of its own, common in rock and in film scores.
- Keep the melody on the flat seventh
The note that creates the whole effect deserves to be heard.
- Slow it right down
At half speed the same chords stop being rock and start being cinematic.
When to reach for it
For riffs. For anything that must loop without resolving. For a chorus that should sound wide rather than sweet.
When to leave it alone
When you need a real ending. Without a leading tone, an ending here always sounds like a fade rather than a full stop.