About the B♭dim7 chord
The diminished seventh is built entirely from minor thirds, so the same shape repeats every three frets. It is a dramatic passing chord in jazz, gypsy swing and classical music. The symbol for it is B♭dim7. (also written A♯dim7)
B♭1
D♭♭3
F♭♭5
G𝄫7
How to play B♭dim7
- Lay your index finger flat across the top 6 strings at fret 6, pressing just behind the fret.
- Put your middle finger on the A string at fret 7.
- Put your ring finger on the D string at fret 8.
- Put your little finger on the B string at fret 8.
- Strum all six strings.
1 index · 2 middle · 3 ring · 4 little
Other B♭ chords
B♭dim7 chord questions
What notes are in a B♭dim7 chord?
B♭dim7 is made of B♭, D♭, F♭ and G. In intervals that is 1, ♭3, ♭5, 𝄫7 above the root, B♭.
What is the easiest way to play B♭dim7?
The first shape above is the most common one: 6 7 8 6 8 6 from the low E string to the high E, where x means don't play that string and 0 means play it open. Start there, and try the other shapes once it feels comfortable.
Is B♭dim7 a barre chord?
The main shape uses a barre, where one finger holds down several strings at once. Press just behind the fret and roll the finger slightly onto its side.