Sevenths · A# root / B♭
A#7 / B♭7
Tense and driving. Creates the strongest pull toward the tonic.
Notes in A#7
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#7, A#m, A#7, or another quality — the hardest and most useful ear training skill.
Dominant 7th in All 12 Keys
Other Chords in A#
Related Sevenths
About the A#7 Chord
The A#7 chord is a dominant 7th chord built on A# (also written B♭7). It contains the notes Bb, D, F, Ab — the root, third, fifth, and seventh.
Tense and driving. Creates the strongest pull toward the tonic. Practising the A#7 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.