B°
Triads · B root
B°
A tense, unstable triad built from two stacked minor thirds.
0 st3 st6 st
Notes in B°
BRoot
D3rd
F5th
B is less common as a home key but appears often as the III or VII chord in various progressions.
Identify the Chord Quality on B
Each chord below is played on B. Listen and identify whether you heard B°, Bm, B7, or another quality — the hardest and most useful ear training skill.
Diminished in All 12 Keys
Other Chords in B
Related Triads
About the B° Chord
The B° chord is a diminished chord built on B. It contains the notes B, D, F — the root, third, and fifth.
A tense, unstable triad built from two stacked minor thirds. Practising the B° 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.