The Deep House Vamp
A minor seventh and a dominant seventh a fourth above it, swinging back and forth. That dominant chord never resolves and is not supposed to: it is there because of one note, the Dorian sixth, sitting in the most audible place a note can sit.
- 2 chords
- Dorian sixth
- a dominant that never resolves
same family
The progression
i7 - IV7
Why it works
In A that is Am7 and D7. The F sharp in D7 is the major sixth of A, the note that makes Dorian Dorian, and in this chord it is the third, which is where you hear a note most clearly. So the major IV is not a choice or a borrowed chord, it is a consequence. Flatten that F sharp and the chord becomes Dm7 by itself, and you are in natural minor.
Hear it in context
The two chords share A and C, half their notes. The E steps down to D and the G steps down to F sharp, both by a single step, so nothing has to leap. Played rootless the overlap is larger still: C, E, G against F sharp, A, C, with the bass telling you which chord it is. D7 is built like a dominant but behaves like colour: the tritone gives friction and shine and points nowhere. Put an E7 in between and it collapses, because the G sharp it brings does not exist in A Dorian.
Make it yours
- Voice it high and wide
Root in the bass, everything else above middle C.
- Use the seventh, not a triad
A plain D major loses the shared C, and the shift stops being a shift and becomes a change.
- Add the ninth
More air, no more weight.
When to reach for it
For house and any downtempo groove, and whenever the vocal or the bass is the real subject.
When to leave it alone
When the track needs harmonic movement to hold attention for four minutes.