Aø7
Sevenths · A root
Aø7
Also called min7♭5. The ii° in minor key ii-V-I progressions.
0 st3 st6 st10 st
Notes in Aø7
ARoot
C3rd
D#5th
G7th
A is the reference pitch (A440). Very common in rock and pop — the vi chord in C major.
Identify the Chord Quality on A
Each chord below is played on A. Listen and identify whether you heard Aø7, Am, A7, or another quality — the hardest and most useful ear training skill.
Half Diminished in All 12 Keys
Other Chords in A
Related Sevenths
About the Aø7 Chord
The Aø7 chord is a half diminished chord built on A. It contains the notes A, C, D#, G — the root, third, fifth, and seventh.
Also called min7♭5. The ii° in minor key ii-V-I progressions. Practising the Aø7 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.