B♭7♯5
Bb Dominant 7th Sharp 5 — the augmented dominant — the raised fifth leans hard into the resolution a fifth below.
The keys
B♭ – D – F♯ – A♭
What's inside B♭7♯5
| Note | Interval from root | Degree |
|---|---|---|
| B♭ | Root | 1 |
| D | Major 3rd | 3 |
| F♯ | Augmented 5th | #5 |
| A♭ | Minor 7th | b7 |
Inversions
| Position | Keys (low → high) |
|---|---|
| Root position | B♭4 – D5 – G♭5 – A♭5 |
| 1st inversion | D5 – G♭5 – A♭5 – B♭5 |
| 2nd inversion | G♭5 – A♭5 – B♭5 – D6 |
| 3rd inversion | A♭5 – B♭5 – D6 – G♭6 |
A working voicing
Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:
| Hand | Keys |
|---|---|
| Left (shell) | B♭2 – A♭3 |
| Right (colour) | D5 – G♭5 |
Where B♭7♯5 lives
Hard resolution
B♭7♯5 → E♭m9
Altered dominants resolve with maximum drama — especially into minor.
Chromatic approach
Fm7 → B♭7♯5 → E♭
The alteration sharpens the pull of the standard two-five.
Put B♭7♯5 under your fingers
Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.
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