Chord Information
Learn how to play A#maj7 on piano
Notes in Chord
Intervals
Inversion
Notes (bottom to top): A#4 - D5 - F5 - A5
Right Hand Fingering
3=middle, 4=ring, 5=pinky
Interactive Piano
Click the highlighted keys to play the A#maj7 chord
About the A#maj7 Chord
The A#maj7 chord is the theoretical sharp-key sibling of the much more common Bbmaj7. Built from A#-C##-E#-G##, this chord contains two double-sharps, making it essentially impossible to use in practical notation. Whenever you encounter this sound, it will be written as Bbmaj7.
Understanding A#maj7 exists completes your theoretical knowledge, but Bbmaj7 is what matters for playing music. The Bb spelling (Bb-D-F-A) is readable and universally recognized. A#maj7's complicated spelling demonstrates why enharmonic choices favor simplicity.
For pianists, A#maj7 and Bbmaj7 are physically identical. Learning Bbmaj7 thoroughly gives you complete command of this sound. The theoretical existence of A#maj7 is merely a footnote to your practical knowledge.
Music Theory & Usage
A#maj7 would theoretically be I in A# major (ten sharps, including double-sharps), a key that doesn't exist in practice. Bbmaj7 is the universal spelling, functioning as I in Bb major—one of the most important keys in jazz.
Bbmaj7 (the practical spelling) is essential in jazz, appearing as the tonic of countless standards. Bb major suits wind instruments perfectly, making it a favorite key for big band and combo arrangements. The warm sound of Bbmaj7 defines the jazz piano aesthetic.
Famous Songs Using A#maj7
Hear how professional musicians use the A#maj7 chord in these well-known songs:
“Note: Always written as Bbmaj7”
by Various
This chord is universally notated as Bbmaj7
“All the Things You Are”
by Jerome Kern
Features Bbmaj7 (enharmonic to A#maj7) in its famous changes
“Fly Me to the Moon”
by Bart Howard
Uses Bbmaj7 in its romantic progression
“Wave”
by Antonio Carlos Jobim
Bbmaj7 anchors this bossa nova classic
How to Play A#maj7 on Piano
- Place your thumb on A#.
- Place your index finger on D.
- Place your middle finger on F.
- Place your pinky finger on A.
- Press all keys simultaneously to hear the A#maj7 chord.
Recommended fingering: 1-2-3-5 (right hand)
A#maj7 Chord Inversions
The A#maj7 chord can be played in different inversions:
Root Position
A# - D - F - A (bass note: A#)
First Inversion
D - F - A - A# (bass note: D)
Second Inversion
F - A - A# - D (bass note: F)
Common Chord Progressions Using A#maj7
I-IV-V Progression
Common chord progression
I-V-vi-IV Progression
Common chord progression
Practice Tips for A#maj7
- Start slowly and focus on pressing all keys simultaneously for a clean sound.
- Practice transitioning between A#maj7 and other common chords to build muscle memory.
- Listen carefully to how the seventh interval creates tension and color in the chord.
- Practice resolving this chord to its natural target chords in progressions.
Frequently Asked Questions about A#maj7
Is A#maj7 the same as Bbmaj7?
Yes, they're enharmonically identical. Bbmaj7 (Bb-D-F-A) is used exclusively in real music. A#maj7 (A#-C##-E#-G##) with its double-sharps exists only in theory.
What notes are in A#maj7?
A#maj7 contains A# (root), C## (major 3rd, sounds like D), E# (perfect 5th, sounds like F), and G## (major 7th, sounds like A). These spellings show exactly why Bbmaj7 is always preferred.
Why does Bbmaj7 matter so much in jazz?
Bb major is the home key of many wind instruments (trumpet, tenor sax transpose to Bb). Jazz evolved with these instruments, so Bb major became central to the idiom. Bbmaj7 as the tonic provides jazz's characteristic sophisticated sound.
Will I ever need to know A#maj7?
For practical playing, no—learn Bbmaj7. For understanding music theory completely, knowing A#maj7 exists helps grasp the chromatic scale's symmetry. But your fingers will always play Bbmaj7.