B♭ Dominant 7th #9 #5
Bb7#9#5 · Root
Every chord tone stacked from the root up.
Click keys to experiment with the chord
B♭ – D – F♯ – A♭ – C♯
1 – 3 – #5 – b7 – #9
This altered dominant combines two sharp tensions and most often drives a V–I resolution. The altered scale is a natural choice; the root may be left to the bass when a bassist supplies it.
The Bb7#9#5 chord sounds distinctive, with a dominant 7th #9 #5 character. Its notes are Bb, D, F#, Ab, C#.