A# Major 9th

Notes:A# – D – F – A – C
Formula:R-M3-P5-M7-M9
Intervals:P1-M3-P5-M7-M9
Scale Degrees:1-3-5-7-9

Introduction

The A# Major 9th piano chord (A#maj9) consists of the notes A#, D, F, A, C. It is a major 7th chord with an added major 9th, giving it a lush, sophisticated character often used in jazz, R&B, and neo-soul progressions. Formula: R-M3-P5-M7-M9 | Scale degrees: 1-3-5-7-9.

Enharmonic equivalent: A♯ is enharmonically equivalent to B♭. See Bb Major 9th.

Notes

Notes:A# – D – F – A – C

A# Major 9th Inversions

PositionNotes
Root PositionA#4 – D5 – F5 – A5 – C6
1st InversionD5 – F5 – A5 – A#5 – C6
2nd InversionF5 – A5 – A#5 – C6 – D6

Key Signature

The key of A# Major 9th has Key signature data not available.

Theory: Intervals

Formula: R-M3-P5-M7-M9
Intervals: P1-M3-P5-M7-M9

The A# Major 9th is built by stacking intervals from the root note. The formula R-M3-P5-M7-M9 describes the scale degrees used. The intervals P1-M3-P5-M7-M9 show the distance between each note in the chord.

A# Major 9th — Frequently Asked Questions

What notes are in the A# Major 9th chord?

A# Major 9th is built from the A# root. Check the interactive keyboard above for exact notes and fingering.

How is the A# Major 9th chord used in music?

A# Major 9th appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Major 9th).

What is the fingering for A# Major 9th?

See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.

What are the inversions of A# Major 9th?

Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.

Practice Tips

  • Rich, extended jazz voicing.
  • The 9th adds colour and depth.
  • Practice dropping less essential notes.
  • Compare with the simpler 7th version.
  • Jazz, R&B, neo-soul applications.
  • Spread voicings sound best.