Triads · A# root / B♭
A#sus4 / B♭sus4
A suspended chord with the perfect 4th replacing the third. Creates tension.
Notes in A#sus4
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#sus4, A#m, A#7, or another quality — the hardest and most useful ear training skill.
Sus4 in All 12 Keys
Other Chords in A#
Related Triads
About the A#sus4 Chord
The A#sus4 chord is a sus4 chord built on A# (also written B♭sus4). It contains the notes Bb, Eb, F — the root, third, and fifth.
A suspended chord with the perfect 4th replacing the third. Creates tension. Practising the A#sus4 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.