Space plays and stops
- Notes and intervals
- DbM3Fm3Abm3Cbm3D
- Extends
- Db Dominant 7
Db Dominant b9, written Db7b9, is built from Db, F, Ab, Cb and D: the root, major 3rd, 5th, minor 7th and flat 9th.
Its 3rd and 7th, F and Cb, are its guide tones: they say what kind of chord it is, so voicings are built around them and the root is often left to the bass. G7, a tritone away, has the same two notes the other way up, so it can stand in for Db7b9 as its tritone substitute.
In the progressions here, Db7b9 is the V7♭9 of the Minor ii-V to Major Progression in Gb.