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A#7(Dominant 7th Chord)

A major triad with a minor seventh. Creates harmonic tension that resolves to the tonic.

Notes
A# – D – F – G#
Intervals (semitones)
0 – 4 – 7 – 10
Type
7th Chord

🎹 A#7 on Piano

Press highlighted keys simultaneously to play the A#7 chord.

R
A#(Root (R))
2
D(Major 3rd)
3
F(Perfect 5th)
4
G#(Minor 7th (♭7))

🎸 A#7 on Guitar

The A#7 chord uses notes A#, D, F, G#. Build a voicing by finding these notes on any strings — root on the 6th string is a common starting point for barre chord shapes.

Interval Analysis

DegreeInterval NameSemitonesNote in A#
RootRoot (R)0A#
3rdMajor 3rd4D
5thPerfect 5th7F
7thMinor 7th (♭7)10G#

About the A# Dominant 7th Chord

The A#7 chord (A# Dominant 7th) consists of 4 notes: A#, D, F, G#. A major triad with a minor seventh. Creates harmonic tension that resolves to the tonic.

To build any dominant 7th chord, apply intervals of 0, 4, 7, 10 semitones above the root. Starting from A#: the notes land on A#, D, F, G#.

Playing A#7 on Piano

Press A#, D, F, G# simultaneously. In root position, A# is lowest. First inversion places D in the bass for a lighter sound; second inversion uses F as the bass note.

Common Chord Progressions Using A#7

  • I–IV–V: A#7 – D#7 – F7 (blues and rock)
  • I–V–vi–IV: A#7 – F – Gm – D# (pop staple)
  • I–vi–IV–V: A#7 – Gm – D# – F (50s progression)

The A#7 Chord in Context

As a dominant 7th chord, A#7 is the tonic (I) in the key of A# major. It also appears as the IV chord in F major, and as the V chord in D# major — making it one of the most important chords across all of Western music.

Other A# Chords

A#
Major
A#m
Minor
A#maj7
Major 7th
A#m7
Minor 7th
A#dim
Diminished
A#aug
Augmented

Dominant 7th Chord in All 12 Keys

C7C#7D7D#7E7F7F#7G7G#7A7A#7B7
🎹 Virtual Piano
Play A#7 on piano
🎸 Virtual Guitar
See on the fretboard
🎵 A# Scale
Notes that fit A#7
🎶 Songs
Find songs using A#7

FAQ

A#7 Chord — Frequently Asked Questions

What notes are in the A#7 chord?
The A# Dominant 7th chord contains: A#, D, F, G#. These notes are derived by applying the dominant 7th interval formula (0–4–7–10 semitones) to the root note A#.
What is the A#7 chord used for?
A major triad with a minor seventh. Creates harmonic tension that resolves to the tonic. The A#7 chord is used across pop, rock, jazz, and classical music. As the I chord in the key of A# major, it functions as the most stable resting point in progressions.
How do you play A#7 on piano?
On piano, play A#, D, F, G# simultaneously. In root position, A# is the lowest note. Inversions move the bass note up — first inversion has D lowest, second inversion has F lowest.
How many notes are in a dominant 7th chord?
A dominant 7th chord has 4 notes: A#, D, F, G# (in A#). It is a 7th chord, extending beyond the basic triad.
What is the difference between A# major and A# minor?
The A# major chord (A#–D–F) uses a major third (4 semitones), giving it a bright, happy sound. The A# minor chord (A#–C#–F) uses a minor third (3 semitones), giving it a darker, emotional sound.
What key does A#7 belong to?
A#7 naturally serves as the I chord in the key of A# major. It also appears as IV in the key of F major, and as V in the key of D# major.
Can I play A#7 on ukulele?
Yes. The ukulele uses GCEA tuning with 4 strings. The A#7 chord notes (A#, D, F, G#) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.
What chords go well with A#7?
In the key of A# major, A#7 pairs naturally with D# major (IV), F major (V), and Gm (vi). The classic I–IV–V (A#7–D#–F) is the foundation of blues, country, and rock.
What is a chord inversion of A#7?
An inversion places a non-root note in the bass. A#7 root position: A# in bass. First inversion: D in bass. Second inversion: F in bass. Inversions create smoother bass line movement without changing the harmony.
How do I memorize the notes in a dominant 7th chord?
Remember the formula: 0–4–7–10 semitones from root. For A#7: start on A#, add 4 semitones, then 7 semitones, then 10 semitones. Practicing this across all 12 roots builds instant recognition of any dominant 7th chord.