Triads · A# root / B♭
A#+ / B♭+
An ambiguous, dreamlike triad built from two stacked major thirds.
Notes in A#+
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#+, A#m, A#7, or another quality — the hardest and most useful ear training skill.
Augmented in All 12 Keys
Other Chords in A#
Related Triads
About the A#+ Chord
The A#+ chord is a augmented chord built on A# (also written B♭+). It contains the notes Bb, D, Gb — the root, third, and fifth.
An ambiguous, dreamlike triad built from two stacked major thirds. Practising the A#+ 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.