Extended · A# root / B♭
A#maj9 / B♭maj9
Lush and expansive. Adds colour above the major 7th chord.
Notes in A#maj9
A# / Bb is a favourite for horn players and jazz musicians. Many blues and jazz standards are in Bb.
Identify the Chord Quality on A#
Each chord below is played on A#. Listen and identify whether you heard A#maj9, A#m, A#7, or another quality — the hardest and most useful ear training skill.
Major 9th in All 12 Keys
Other Chords in A#
Related Extended
About the A#maj9 Chord
The A#maj9 chord is a major 9th chord built on A# (also written B♭maj9). It contains the notes Bb, D, F, A, C — the root, third, fifth, seventh, and extensions.
Lush and expansive. Adds colour above the major 7th chord. Practising the A#maj9 chord across different voicings and contexts builds the harmonic recognition that lets you identify it instantly in any musical setting — whether in a band mix, a recording, or a live performance.