Space plays and stops
- Left hand
- Bb2
- Right hand
- D4F4Ab4Cb5
- Family
- 4-Note Rootless (Type A/B)
The Type A voicing of Bb7b9 stacks D, F, Ab and Cb from the bottom up: the major 3rd, 5th, minor 7th and flat 9th of the chord. It leaves out the root, Bb, for the left hand or the bass player to take.
It's one of the 4-Note Rootless (Type A/B) voicings: four-note rootless voicings in their two forms, with the 3rd or the 7th on the bottom, played over the root. The other for Bb7b9 is Type B.