Bbaug9 guitar chord
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About Bbaug9 — 9th in bass
Bbaug9 is Bb, D, F#, Ab and C. Start with and raise the 5th from to . You’ll also see this chord written Bb9♯5 or Bb9(♯5).
Hear what that one-note change does by comparing with Bbaug9.
Hear the change
Only the 5th changes: F rises a half step to F♯. The other notes stay in place.
When Bbaug9 resolves to , that can rise another half step to .
Also written Bb9#5, Bb+9 or Bb9(#5).
What 9th in bass means
Bbaug9 in 9th in bass puts C in the bass instead of Bb, the 9th of the chord. The notes are the same; what changes is what the bass line does, which is most of why you would reach for it — it lets the lowest voice move by step where the root would have jumped.
One of Bbaug9’s 10 shapes does this:x-x-10-11-9-10
How to use Bbaug9
Bbaug9 is a dominant with its tension raised, so it still points at — harder than a plain seventh does. A plain dominant has two voices a semitone from home; an altered one has four, because every altered tone is also sitting a semitone from a note of Eb. More voices leaning the same way is all "more tension" means here.
In a phrase:→→
The ii–V–I of Eb.
Voice by voice, Bbaug9 → . 3 voices move by a semitone, and one note is common to both chords. Those semitones are what the ear follows; the rest is the chord rearranging itself underneath.
| In Bbaug9 | Moves | In Eb |
|---|---|---|
| Bb, the root | stays where it is | Bb, the fifth |
| D, the major third | rises a semitone | Eb, the root |
| F#, the sharp fifth | rises a semitone | G, the major third |
| Ab, the flat seventh | falls a semitone | G, the major third |
| C, the ninth | falls a whole tone | Bb, the fifth |
What to play over Bbaug9
Useful scales
- +E
Contains Bbaug9 and adds flat fifth.
Chords near Bbaug9
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The common shapes and the derived voicings come from different places, and both are explained in how this site is built.