Extended · A# root / B♭
A#11 / B♭11
Dense and atmospheric. The 11th adds a suspended quality over the dominant.
Notes in A#11
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#11, A#m, A#7, or another quality — the hardest and most useful ear training skill.
11th in All 12 Keys
Other Chords in A#
Related Extended
About the A#11 Chord
The A#11 chord is a 11th chord built on A# (also written B♭11). It contains the notes Bb, D, F, Ab, C, Eb — the root, third, fifth, seventh, and extensions.
Dense and atmospheric. The 11th adds a suspended quality over the dominant. Practising the A#11 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.