The B Augmented 7th chord is a four-note chord made up of B, D♯, F♯♯, and A. It is built from a root, major third, augmented fifth, and minor seventh.
Construction
B Augmented 7th = Root + Major 3rd + Minor 6th + Minor 7th = B · D♯ · F♯♯ · A
| Note | Interval | Degree |
|---|---|---|
| B | Root | 1 |
| D♯ | Major 3rd | 3 |
| F♯♯ | Minor 6th | ♯5 |
| A | Minor 7th | ♭7 |
B Augmented 7th Inversions
| Position | Notes |
|---|---|
| Root Position | B – D♯ – F♯♯ – A |
| 1st Inversion | D♯ – F♯♯ – A – B |
| 2nd Inversion | F♯♯ – A – B – D♯ |
| 3rd Inversion | A – B – D♯ – F♯♯ |
Key Signature
A Augmented 7th chord is built from symmetrical or ambiguous intervals, so it doesn’t belong to a single key and has no key signature of its own.
Same Notes, Other Names
The notes B – D♯ – F♯♯ – A aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
B Augmented 7th — Frequently Asked Questions
What is the B Augmented 7th chord on piano?
The B Augmented 7th chord contains the notes B – D♯ – F♯♯ – A. On piano, play these notes together to sound the chord.
What notes are in the B Augmented 7th chord?
The B Augmented 7th chord (B+7) contains four notes: B (root), D# (major third), F## (augmented fifth, enharmonically G), and A (minor seventh). It combines an augmented triad with a minor seventh.
How does B Augmented 7th differ from B Dominant 7th?
Both contain B, D#, and A. B+7 has F##/G (augmented fifth) while B7 has F# (perfect fifth). The raised fifth adds extra chromatic tension.
How is B Augmented 7th used in music?
B+7 is an altered dominant resolving to E Major. The F##/G pulls up to G# while A pulls down to G# — converging on the third of E. Common in jazz and blues in the key of E.
What genres use Augmented 7th chords?
Augmented 7th chords are common in jazz, gospel, blues, and R&B for adding emotional intensity to dominant resolutions.
What songs use Augmented 7th chords?
Augmented 7th chords appear in jazz standards and blues. B+7 resolves to E Major, a very common key in blues and rock.
What is the difference between +7 and 7#5?
They are the same chord. B+7, B7#5, and Baug7 all refer to B Augmented 7th.